Java Programming Assignment Help

Java is programing language developed in 1995 for computing platform. Being a high-level language, it has gained a lot of popularity in the software development world. Today, Java is one of the most important programming languages used for the development of mobile and web based applications. With the growing demand for networked applications, Java has become the foundation for scripting and developing enterprise software, mobile applications, games, and web-based content.

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JAVA is a computer programming language. It is an object oriented concurrent and structured language. Java is cross platform and works on Windows, Mac and Linux without changing the code. You can also use Java on Android although there are some differences between standard Java and the Android variant.

The following is an example Java project, so if you need Java programming homework help check out this program.

Swing GUI

For this assignment, you are required to develop a Java Graphical User Interface (GUI) Application to demonstrate you can use Java constructs including input/output via a GUI, Java primitive and built-in types, Java defined objects, arrays or ArrayLists, selection and looping statements and various other Java commands. Your program must produce the correct results.

The code for the GUI is supplied and is available on the course website. You must complete the underlying code to implement the program. The buttons have been activated and are linked to appropriate methods in the given code. Please spend a bit of time looking at the given code to familiarise yourself with it and where you have to complete the code.

You can create your own GUI if you choose to but DO NOT use any GUI generators.



It took me about an hour to finish coding this assignment, and another hour to test, take snapshots, and write document. The description of this assignment is straightforward; I had no problem implementing it. So if you need Java programming project help you are in the right place. The sort function of parallel arrays is implemented with insertion sort.


  1. Register a car with no number
  2. Register a car
  3. Display all cars
  4. Sort and display
  5. Search with registration number (no matched)
  6. Search with registration number
  7. Quit confirmation

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    Course: Programming Fundamentals COIT11222 2014 Term2
    Purpose: Assignment two -- Motorcity Car Insurance GUI application
    Programmer: Bernard Li
    Date: 14 August 2014

    Enter your header comment here
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JComboBox;
import javax.swing.JCheckBox;
import javax.swing.JOptionPane;
import java.awt.FlowLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;

public class CarInsuranceGUI extends JFrame
    // declare your data structures and class variables here //
    // information of car registrations (four parallel lists)
    private ArrayList<String>  regNumbers;
    private ArrayList<Integer> ages;
    private ArrayList<Boolean> hasAccidents;
    private ArrayList<Double>  fees;

    // total number of cars limitation
    private static final int LIMIT = 10;
    // constant in calculation of fee
    private static final int AGE_THRESHOLD = 5;
    private static final int FEE1 = 200;
    private static final int FEE2 = 350;
    private static final double DISCOUNT = 0.25;

    // GUI components
    JLabel registrationLabel;       // label for registration field
    JTextField registrationField;   // field to enter the cars's registration
    JLabel ageLabel;                // label for selecting the car's age from drop-down combo box
    JComboBox<String> ageCombo;     // drop-down combo box for selecting the car's age
    JCheckBox accidentCheckBox;     // check box for selecting if car has been in an accident or not
    JButton enterButton;            // button for entering car's detail
    JButton displayAllButton;       // button to display all cars entered so far
    JButton sortButton;             // button to sort the car records by name
    JButton searchButton;           // button to search for a car using it's registration
    JButton exitButton;             // button to exit the program
    JTextArea textArea;             // text area for displaying the data
    JScrollPane scrollPane;         // scoll pane for text area scrolling

    // Constructor
    public CarInsuranceGUI()
        super("Motorcity Car Insurance");               // invoke JFrame constructor
        setLayout(new FlowLayout());                    // set the layout to flow layout

        registrationLabel = new JLabel("Registration"); // create registration label
        add(registrationLabel);                         // add the label to the JFrame
        registrationField = new JTextField(15);         // create registration field
        add(registrationField);                         // add the registration field to the JFrame

        ageLabel = new JLabel("Age");                   // create age label
        add(ageLabel);                                  // add the name label
        ageCombo = new JComboBox<String>();             // create the age combo box
        for (int i = 0; i <= 30; i++)                   // populate the age combo box with numbers 0-30
            ageCombo.addItem(i + "");                   // add number as a string
        add(ageCombo);                                  // add the age combo

        accidentCheckBox = new JCheckBox("Accident?");  // create accident checkbox
        add(accidentCheckBox);                          // add accident checkbox

        enterButton = new JButton("Enter");             // create enter button
        add(enterButton);                               // add enter button

        displayAllButton = new JButton("Display All");  // create display all button
        add(displayAllButton);                          // add display all button

        sortButton = new JButton("Sort");               // create sort button
        add(sortButton);                                // add sort button

        searchButton = new JButton("Search");           // create search button
        add(searchButton);                              // add search button

        exitButton = new JButton("Exit");               // create exit button
        add(exitButton);                                // add exit button

        textArea = new JTextArea(16, 52);               // create text area
        // set text area to a monospaced font so the columns can be aligned using a format string
        textArea.setFont(new Font("Monospaced", Font.PLAIN, 12));
        textArea.setEditable(false);                    // set the text area to be read only
        scrollPane = new JScrollPane(textArea);         // put the text area into the scroll pane
        add(scrollPane);                                // add the scroll pane

        // add the ActionListener objects to all of the buttons and the name field
        ButtonHandler buttonEvent = new ButtonHandler();    // create event handler object


        // when the user pushes the system close (X top right corner)
        addWindowListener( // override window closing method
            new WindowAdapter()
                public void windowClosing(WindowEvent e)
                    exit(); // Attempt to exit application

        // contruct your data structures and set up your class variables here //
        regNumbers = new ArrayList<String>();
        ages = new ArrayList<Integer>();
        hasAccidents = new ArrayList<Boolean>();
        fees = new ArrayList<Double>();
    } // end constructor

    // method used to enter that data for a car
    private void enterData()
        // make sure the registration number is not empty
        String regNumber = this.registrationField.getText().trim();

        if ("".equals(regNumber)) {
                "Please enter a car's registration",
                "Error", JOptionPane.ERROR_MESSAGE);
        // make sure have not reached the limit of cars
        if (this.regNumbers.size() >= LIMIT) {
                "You have reached the limit of cars to enter", 
                "Error", JOptionPane.ERROR_MESSAGE);

        // add the current registration to the parallel arrays
        int age = Integer.parseInt((String)ageCombo.getSelectedItem());
        boolean hasAccident = accidentCheckBox.isSelected();
        // calculate the fee
        double fee = (age <= AGE_THRESHOLD ? FEE1 : FEE2);
        if (!hasAccident) {
            fee -= fee * DISCOUNT;

        // clear fields

        // display the current car
        ArrayList<Integer> indices = new ArrayList<Integer>();
        indices.add(this.regNumbers.size() - 1);

    }// enterData

    // display car information at the given indices
    private void displayCars(ArrayList<Integer> indices)

        // display the table header
        String header = String.format("%-20s %-10s %-8s %11s\n", 
            "Registration", "Age", "Accident", "Fee");

        for (Integer i : indices) {
            String fee = String.format("$%.2f", this.fees.get(i));
            String line = String.format("%-20s %-10d %-8s %11s\n",
                this.hasAccidents.get(i) ? "Yes" : "No",

    // method used to display the cars entered into the program
    private void displayAll()
        // display cars
        ArrayList<Integer> indices = new ArrayList<Integer>();
        for (int i = 0; i < this.regNumbers.size(); i++) {


        // calculate total
        double total = 0;
        for (double fee : fees) {
            total += fee;
        // display total fee
        String totalLine = String.format("Total fees: $%.2f", total);
        totalLine = String.format("%52s", totalLine);

    }// displayAll

    // method used to sort the car arrays based on registration
    private void sort()
        // insertion sort
        for (int i = 1; i < this.regNumbers.size(); i++) {
            String regNumber = this.regNumbers.get(i);
            Integer age = this.ages.get(i);
            Boolean hasAccident = this.hasAccidents.get(i);
            Double fee = this.fees.get(i);

            // find a proper position in [0, i) to insert
            int j = i - 1;
            while (j >= 0 && this.regNumbers.get(j).compareTo(regNumber) > 0) {
                // shift this one right
                this.regNumbers.set(j + 1, regNumbers.get(j));
                this.ages.set(j + 1, ages.get(j));
                this.hasAccidents.set(j + 1, hasAccidents.get(j));
                this.fees.set(j + 1, fees.get(j));
                j --;
            // insert
            this.regNumbers.set(j + 1, regNumber);
            this.ages.set(j + 1, age);
            this.hasAccidents.set(j + 1, hasAccident);
            this.fees.set(j + 1, fee);

        // display again

    }// sort

    // method used to search for a car by registration
    private void search()
        String regNumber = JOptionPane.showInputDialog(this, 
            "Enter registration of the car to search",
            "Input", JOptionPane.OK_OPTION);

        if (regNumber == null) {
            // user canceled, do nothing

        ArrayList<Integer> indices = new ArrayList<Integer>();

        // linear search the regnumber ignoring case
        for (int i = 0; i < this.regNumbers.size(); i++) {
            if (regNumber.equalsIgnoreCase(this.regNumbers.get(i))) {

        if (indices.isEmpty()) {
            // not found
                String.format("%s car not found", regNumber), 
                "Message", JOptionPane.WARNING_MESSAGE);
        } else {

    }// search

    // method used to exit the program
    // a confirmation dialog should be shown to the user before exiting
    private void exit()
        // display the confirmation dialog
        int option = JOptionPane.showConfirmDialog(this, 
            "Do you really want to exit?",
            "Exit Confirmation", JOptionPane.YES_OPTION);

        if (option == JOptionPane.YES_OPTION) {

    }// exit

    public static void main(String [] args)
    { // main method to create an instance of the class
        CarInsuranceGUI carInsurance = new CarInsuranceGUI();           // create instance of class

        carInsurance.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);  // let the code close the program
        carInsurance.setSize(440, 390);                                     // dimensions of the JFrame
        carInsurance.setVisible(true);                                      // make the application visible
    } // main

    // private class used as an action listener for the buttons
    private class ButtonHandler implements ActionListener
        public void actionPerformed(ActionEvent e)
            if (e.getSource() == enterButton || e.getSource() == registrationField) // enter button or return hit in registration field
            else if (e.getSource() == displayAllButton)                     // display all button hit
            else if (e.getSource() == sortButton)                           // sort button hit
            else if (e.getSource() == searchButton)                         // search button hit
            else if (e.getSource() == exitButton)                           // exit button hit
    }// end ButtonHandler

}// end class

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Java Programming Homework Help

ATM Machine

You’re required to implement the ATM deposit and withdraw examples and investigate synchronisation behaviour we discussed in this course.

Your ATM deposit/withdraw simulation has the following setup:

  • The initial balance of the shared account is $1000.0
  • One user withdraws $100.0
  • One user deposits $100.0

Your simulation code should create two threads, one for withdrawing and one for depositing, and both can access a shared variable for the account balance. In your code, each thread should simulate the following behaviors:

  1. get the old balance value
  2. Sleep for one second (i.e. withdrawing/depositing money at the ATM machine.)
  3. update the new balance value

You’re required to implement two simulations: (1) Broken bank ATM simulation, and (2) Safe bank ATM simulation.

(1) Broken bank ATM simulation

In this simulation, you’re required to submit the simulation without synchronisation. An example of the output is shown below:

Deposit: old balance = 1000.0
Withdraw: old balance = 1000.0
Deposit: amount = 100.0
Withdraw: amount = 100.0
Deposit: new balance = 1100.0
Withdraw: new balance = 900.0

Your main() method should be provided in a file called Your code should be executable for assessment

> javac \*.java
> java DriverATM\_broken

(2) Safe bank ATM simulation

In this simulation, you’re required to submit the simulation with synchronisation. (hint: use synchronized methods, An example of the output is shown below:

Deposit: old balance = 1000.0
Deposit: amount = 100.0
Deposit: new balance = 1100.0
Withdraw: old balance = 1100.0
Withdraw: amount = 100.0
Withdraw: new balance = 1000.0

Your main() method should be provided in a file called Your code should be executable for assessment

> >javac \*.java
> >java DriverATM

class Balance {
    private double balance = 1000.0;

    public double getBalance() {
        return balance;

    public void deposit(double amount) {
        balance += amount;

    public void withdraw(double amount) {
        balance -= amount;

class BrokenDepositThread extends Thread {
    private Balance balance;

    public BrokenDepositThread(Balance b) {
        this.balance = b;

    public void run() {
        System.out.println("Deposit: old balance = " + balance.getBalance());

        try {
        } catch (InterruptedException ex) {

        System.out.println("Deposit: amount = 100");
        System.out.println("Deposit: new balance = " + balance.getBalance());        

class BrokenWithdrawThread extends Thread {
    private Balance balance;

    public BrokenWithdrawThread(Balance b) {
        this.balance = b;

    public void run() {
        System.out.println("Withdraw: old balance = " + balance.getBalance());

        try {
        } catch (InterruptedException ex) {

        System.out.println("Withdraw: amount = 100");
        System.out.println("Withdraw: new balance = " + balance.getBalance());        

public class DriverATM_broken {

    public static void main(String args[]) {
        Balance balance = new Balance();

        new BrokenDepositThread(balance).start();
        new BrokenWithdrawThread(balance).start();

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class DepositThread extends Thread {
    private Balance balance;

    public DepositThread(Balance b) {
        this.balance = b;

    public void run() {
        synchronized(balance) {
            System.out.println("Deposit: old balance = " + balance.getBalance());

            try {
            } catch (InterruptedException ex) {

            System.out.println("Deposit: amount = 100");
            System.out.println("Deposit: new balance = " + balance.getBalance());        

class WithdrawThread extends Thread {
    private Balance balance;

    public WithdrawThread(Balance b) {
        this.balance = b;

    public void run() {
        synchronized(balance) {
            System.out.println("Withdraw: old balance = " + balance.getBalance());

            try {
            } catch (InterruptedException ex) {

            System.out.println("Withdraw: amount = 100");
            System.out.println("Withdraw: new balance = " + balance.getBalance());        

public class DriverATM {

    public static void main(String args[]) {
        Balance balance = new Balance();

        new DepositThread(balance).start();
        new WithdrawThread(balance).start();

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Temperature conversion

For this assignment you will write a class the represents a temperature.

A Little History

Daniel Gabriel Fahrenheit (1686-1736) devoted most of his life to creating precision meteorological instruments. Fahrenheit invented the mercury thermometer in 1714. Fahrenheit sought to create a practical temperature scale in which 0 corresponded with the coldest temperature normally encountered in Western Europe and 100 corresponded to the hottest temperature. Fahrenheit initially created a temperature scale in which 0 represented the temperature of a salt and ice mixture, 30 represented the freezing point of water, and 90 represented the mean human body temperature. Fahrenheit later adjusted his temperature scale so that 32 represented the freezing point of water and 212 represented the boiling point of water. The units of the Fahrenheit temperature scale were designated “degree Fahrenheit” (symbol °F). The Fahrenheit temperature scale is still used today in many countries, including the United States.

In 1742, Anders Celsius (1701-1744) created an inverted centigrade temperature scale in which 0 represented the boiling point of water and 100 represented the freezing point.

In 1744, Carl Linnaeus (1707-1778) suggested reversing the temperature scale of Anders Celsius so that 0 represented the freezing point of water and 100 represented the boiling point. The centigrade relative temperature scale gradually became popular throughout the world. The units of the centigrade temperature scale were designated “degree Celsius” (symbol °C).

In 1848, William Thomson (1824-1907) proposed a thermodynamic temperature scale which assigned 0 to thermodynamic absolute zero and used the degree centigrade as its base unit. This absolute scale was later named the centigrade thermodynamic temperature scale (after Thomson’s peer title) and its unit designated “degree Kelvin” (symbol °K).

In 1859, William John Macquorn Rankine (1820-1872) proposed another thermodynamic temperature scale which also assigned 0 to thermodynamic absolute zero, but used the degree Fahrenheit as its base unit. This absolute scale was later named the Rankine thermodynamic temperature scale and its unit designated “degree Rankine” (symbol °R).

Some Formulas

The following table shows how to convert among these four standard temperature scales

From To Formula
Fahrenheit Celsius °C = (°F – 32) * 5/9
Fahrenheit Kelvin °K = (°F + 459.67) * 5/9
Fahrenheit Rankine °R = °F + 459.67
Celsius Fahrenheit °F = (°C * 9/5) + 32
Celsius Kelvin °K = °C + 273.15
Celsius Rankine °R = (°C * 9/5) + 32 + 459.67
Kelvin Fahrenheit °F = (°K * 9/5) – 459.67
Kelvin Celsius °C = °K – 273.15
Kelvin Rankine °R = °K * 9/5
Rankine Fahrenheit °F = °R – 459.67
Rankine Celsius °C = (°R – 459.67 – 32) * 5/9
Rankine Kelvin °K = °R / (9/5)

Instance Variables

The Temperature class will have only one instance variable called degrees, which is of type double. This will represent the temperature in degrees Kelvin.


There will be three constructors for the Temperature class:

  1. The default constructor, which sets the temperature to 0 °K.
  2. A constructor that takes one double representing the temperature in degrees Kelvin.
  3. A constructor that takes a temperature of type double and a char representing the scale. The valid scale values are:
‘F’ or ‘f’ Fahrenheit
‘C’ or ‘c’ Celsius
‘R’ or ‘r’ Rankine
‘K’ or ‘k’ Kelvin

Since the temperature is stored in degrees Kelvin, if the initial temperature is in a different scale it will need to be converted before it is stored.

°F → °K °K → °F
°R → °K °K → °R
°C → °K °K → °C

Public Methods

Your class should provide the following methods to allow users to interface with your class

void set(double temp, char scale) sets the temperature (you will need to convert the temperature to Kelvin)
double get() Returns the temperature in Kelvin
double get(char scale) returns the temperature (you will need to convert to the scale indicated)
boolean isLessThan(Temperature t) returns true if this temperature < t
boolean isLessThanOrEqual(Temperature t) returns true if this temperature <= t
boolean isEqual(Temperature t) returns true if this temperature == t
Note that two temperatures that differ by less than 10E-12 should be considered equal.
boolean isGreaterThanOrEqual(Temperature t) returns true if this temperature >= t
boolean isGreaterThan(Temperature t) returns true if this temperature > t
boolean isNotEqualTo(Temperature t) returns true if this temperature != t


import java.math.BigDecimal;

public class Temperature {

    // temperature in degress Kelvin
    private double degrees;

    public Temperature() {

    public Temperature(double degrees) {
        this(degrees, 'K');

    // construct a temperature instance
    // for the given temperature and scale
    public Temperature(double temp, char scale) {
        set(temp, scale);

    // set the temperature of the given scale to this instance
    public void set(double temp, char scale) {
        this.degrees = revert(temp, scale);

    // convert the internal temperature in Kelvin to the given scale
    private double convert(double degrees, char scale) {
        BigDecimal value = new BigDecimal(degrees);

        switch (scale) {
            case 'F':
            case 'f':
                return degrees * 9 / 5 - 459.67;

            case 'C':
            case 'c':
                return degrees - 273.15;

            case 'R':
            case 'r':
                return degrees * 9 / 5;

            case 'K':
            case 'k':
                return degrees;

                throw new IllegalArgumentException("unknown scale");

    // revert the given scaled temperature to Kelvin
    private double revert(double degrees, char scale) {
        BigDecimal value;

        switch (scale) {
            case 'F':
            case 'f':
                // since double is not accurate enough to handle division
                // test103-test114 failed if we do this directly.
                // return (degrees + 459.67) * 5 / 9;
                // thus, use BigDecimal instead
                value = new BigDecimal((degrees + 459.67) * 5);
                // divide by 9 and round up
                value = value.divide(new BigDecimal(9), 10, BigDecimal.ROUND_HALF_DOWN);
                return value.doubleValue();

            case 'C':
            case 'c':
                return degrees + 273.15;

            case 'R':
            case 'r':
                return degrees / (9.0 / 5.0);

            case 'K':
            case 'k':
                return degrees;

                throw new IllegalArgumentException("unknown scale");

    // return temperature in Kelvin
    public double get() {
        return this.degrees;

    // return temperature in the given scale
    public double get(char scale) {
        return convert(this.degrees, scale);

    // return true if temperature < t
    public boolean isLessThan(Temperature t) {
        return get() < t.get();

    // return true if temperature <= t
    public boolean isLessThanOrEqual(Temperature t) {
        return get() <= t.get();

    // return true if temperature == t
    public boolean isEqual(Temperature t) {
        return get() == t.get();

    // return true if temperature >= t
    public boolean isGreaterThanOrEqual(Temperature t) {
        return get() >= t.get();

    // return true if temperature > t
    public boolean isGreaterThan(Temperature t) {
        return get() > t.get();

    // return true if temperature != t
    public boolean isNotEqualTo(Temperature t) {
        return get() != t.get();

Various concepts need to be applied in Java assignments which makes it complicated for students. Hence, students find themselves in a situation where you need help with java assignment. Students are puzzled most of the time in the programming part.

public class TemperatureTester {
    // errorCount is a class variable so all methods can access it.
    static int errorCount = 0;

    public static void main(String[] args) {
        Temperature t = new Temperature();
        check(t.get(), 0, "Test 1");
        check(t.get('K'), 0, "Test 2");
        check(t.get('k'), 0, "Test 3");
        check(t.get('F'), -459.67, "Test 4");
        check(t.get('f'), -459.67, "Test 5");
        check(t.get('C'), -273.15, "Test 6");
        check(t.get('c'), -273.15, "Test 7");
        check(t.get('R'), 0, "Test 8");
        check(t.get('r'), 0, "Test 9");

        t = new Temperature(373.15);
        check(t.get(), 373.15, "Test 10");
        check(t.get('K'), 373.15, "Test 11");
        check(t.get('k'), 373.15, "Test 12");
        check(t.get('F'), 212, "Test 13");
        check(t.get('f'), 212, "Test 14");
        check(t.get('C'), 100, "Test 15");
        check(t.get('c'), 100, "Test 16");
        check(t.get('R'), 671.67, "Test 17");
        check(t.get('r'), 671.67, "Test 18");

        t.set(212, 'F');
        check(t.get(), 373.15, "Test 19");
        check(t.get('K'), 373.15, "Test 20");
        check(t.get('k'), 373.15, "Test 21");
        check(t.get('F'), 212, "Test 22");
        check(t.get('f'), 212, "Test 23");
        check(t.get('C'), 100, "Test 24");
        check(t.get('c'), 100, "Test 25");
        check(t.get('R'), 671.67, "Test 26");
        check(t.get('r'), 671.67, "Test 27");

        t.set(212, 'f');
        check(t.get(), 373.15, "Test 28");
        check(t.get('K'), 373.15, "Test 29");
        check(t.get('k'), 373.15, "Test 30");
        check(t.get('F'), 212, "Test 31");
        check(t.get('f'), 212, "Test 32");
        check(t.get('C'), 100, "Test 33");
        check(t.get('c'), 100, "Test 34");
        check(t.get('R'), 671.67, "Test 35");
        check(t.get('r'), 671.67, "Test 36");

        t.set(100, 'C');
        check(t.get(), 373.15, "Test 37");
        check(t.get('K'), 373.15, "Test 38");
        check(t.get('k'), 373.15, "Test 39");
        check(t.get('F'), 212, "Test 40");
        check(t.get('f'), 212, "Test 41");
        check(t.get('C'), 100, "Test 42");
        check(t.get('c'), 100, "Test 43");
        check(t.get('R'), 671.67, "Test 44");
        check(t.get('r'), 671.67, "Test 45");

        t.set(100, 'c');
        check(t.get(), 373.15, "Test 46");
        check(t.get('K'), 373.15, "Test 47");
        check(t.get('k'), 373.15, "Test 48");
        check(t.get('F'), 212, "Test 49");
        check(t.get('f'), 212, "Test 50");
        check(t.get('C'), 100, "Test 51");
        check(t.get('c'), 100, "Test 52");
        check(t.get('R'), 671.67, "Test 53");
        check(t.get('r'), 671.67, "Test 54");

        t.set(373.15, 'K');
        check(t.get(), 373.15, "Test 55");
        check(t.get('K'), 373.15, "Test 56");
        check(t.get('k'), 373.15, "Test 57");
        check(t.get('F'), 212, "Test 58");
        check(t.get('f'), 212, "Test 59");
        check(t.get('C'), 100, "Test 60");
        check(t.get('c'), 100, "Test 61");
        check(t.get('R'), 671.67, "Test 62");
        check(t.get('r'), 671.67, "Test 63");

        t.set(373.15, 'k');
        check(t.get(), 373.15, "Test 64");
        check(t.get('K'), 373.15, "Test 65");
        check(t.get('k'), 373.15, "Test 66");
        check(t.get('F'), 212, "Test 67");
        check(t.get('f'), 212, "Test 68");
        check(t.get('C'), 100, "Test 69");
        check(t.get('c'), 100, "Test 70");
        check(t.get('R'), 671.67, "Test 71");
        check(t.get('r'), 671.67, "Test 72");

        t.set(671.67, 'R');
        check(t.get(), 373.15, "Test 73");
        check(t.get('K'), 373.15, "Test 74");
        check(t.get('k'), 373.15, "Test 75");
        check(t.get('F'), 212, "Test 76");
        check(t.get('f'), 212, "Test 77");
        check(t.get('C'), 100, "Test 78");
        check(t.get('c'), 100, "Test 79");
        check(t.get('R'), 671.67, "Test 80");
        check(t.get('r'), 671.67, "Test 81");

        t.set(671.67, 'r');
        check(t.get(), 373.15, "Test 82");
        check(t.get('K'), 373.15, "Test 83");
        check(t.get('k'), 373.15, "Test 84");
        check(t.get('F'), 212, "Test 85");
        check(t.get('f'), 212, "Test 86");
        check(t.get('C'), 100, "Test 87");
        check(t.get('c'), 100, "Test 88");
        check(t.get('R'), 671.67, "Test 89");
        check(t.get('r'), 671.67, "Test 90");

        // t1 and t2 are different
        Temperature t1 = new Temperature(1);
        Temperature t2 = new Temperature(2);

        // <
        check(t1.isLessThan(t2), true, "Test 91");
        check(t2.isLessThan(t1), false, "Test 92");

        // <=
        check(t1.isLessThanOrEqual(t2), true, "Test 93");
        check(t2.isLessThanOrEqual(t1), false, "Test 94");

        // ==
        check(t1.isEqual(t2), false, "Test 95");
        check(t2.isEqual(t1), false, "Test 96");

        // >=
        check(t1.isGreaterThanOrEqual(t2), false, "Test 97");
        check(t2.isGreaterThanOrEqual(t1), true, "Test 98");

        // >
        check(t1.isGreaterThan(t2), false, "Test 99");
        check(t2.isGreaterThan(t1), true, "Test 100");

        // !=
        check(t1.isNotEqualTo(t2), true, "Test 101");
        check(t2.isNotEqualTo(t1), true, "Test 102");

        // t1 and t2 are equal, but not exactly
        t1.set(671.67, 'r');
        t2.set(212, 'f');

        // <
        check(t1.isLessThan(t2), false, "Test 103");
        check(t2.isLessThan(t1), false, "Test 104");

        // <=
        check(t1.isLessThanOrEqual(t2), true, "Test 105");
        check(t2.isLessThanOrEqual(t1), true, "Test 106");

        // ==
        check(t1.isEqual(t2), true, "Test 107");
        check(t2.isEqual(t1), true, "Test 108");

        // >=
        check(t1.isGreaterThanOrEqual(t2), true, "Test 109");
        check(t2.isGreaterThanOrEqual(t1), true, "Test 110");

        // >
        check(t1.isGreaterThan(t2), false, "Test 111");
        check(t2.isGreaterThan(t1), false, "Test 112?");

        // !=
        check(t1.isNotEqualTo(t2), false, "Test 113");
        check(t2.isNotEqualTo(t1), false, "Test 114");

        // Print summary
        if(errorCount == 0){
            System.out.println("\nNo Errors Found");
        } else {
            System.out.println("\n" + errorCount + " test(s) failed");

    public static void check(boolean value, boolean expected, String message){
        if(value != expected){
            System.out.println(message + ": got " + value + " expected " + expected);

    public static void check(double value, double expected, String message ){
        if (!approxEqual(value, expected)){
            System.out.println(message + ": got " + value + " expected " + expected);


    public static boolean approxEqual(double x, double y){
        return Math.abs(x - y) < 10E-12;


Here is an example problem that shows the help with Java programming assignment we offer.

Shortest path length


This graph contains 6 vertices (A-F) and 8 edges. As you can see there are multiple ways to get from any vertex to any other vertex. For example, to get from A to E, you can take the direct path A – E (at a cost of 1.5) or take the path A – B – C – E (at a cost of 0.5 + 0.7 + 0.5 = 1.7).

Dijkstra’s algorithm, developed in 1959 by the Dutch computer scientist of the same name, gives a way of computing the “shortest” (lowest-cost) path between any two vertices of a graph. Here’s how the algorithm works. Given a graph and a starting vertex:

  1. Assign each vertex a “distance” value. This will represent the optimal distance betweem that vertex and the starting vertex. To begin with, assign the starting vertex a distance of 0 and all other vertices a distance of ∞.
  2. Mark all vertices as “unvisited”.
  3. From the entire graph, pick the unvisited vertex with the lowest distance value. Note the first time you do this, it’ll always be starting vertex. Call this “current” vertex, V.
  4. Consider each of V’s unvisited neighbors (i.e., vertices directly accessible from V). For each of these neighbors N, compute N’s “tentative” distance by adding V’s distance to the weight of the edge connecting V and N. If this tentative distance is less than N’s existing distance, overwrite N’s distance with the new one. When an overwrite is performed, also record vertex V as the “previous” vertex of vertex N.
  5. Once you’ve checked all of V’s unvisited neighbors, mark V as visited. V is now done, and will not be involved in the algorithm any more.
  6. Check if all of the vertices in the graph have been visited. If so, the algorithm is finished. If not, return to step 3.

Once the algorithm is finished, the final distance values for each vertex represent the minimum cost required to get from the starting vertex to that vertex. The shortest path itself can be found by going to the end vertex, going to it’s “previous” vertex, going to that previous vertex’s own “previous” vertex, and so on until you reach the starting vertex.

Aside from its obvious applications for finding routes on maps, Dijkstra’s algorithm is also used in a number of network routing protocols (algorithms that determine the optimal paths to send data packets over a network).

Here’s a partial of how Dijkstra’s algorithm would work to compute the lowest-cost apth between vertex A and any other vertex in the graph above.

Here’s a partial example of how Dijkstra’s algorithm would work to compute the lowest-cost path between vertex A and other vertex in the graph above.

1. Start by assigning all vertices a distance value of ∞, except A itself. Vertex A gets a distance of 0, since it’s the starting vertex. Also mark all vertices as unvisited.


2. Pick the lowest-distance unvisited vertex from the entire graph. In this case it is vertex A. For each of A’s unvisited neighbors (B, D and E) compute their tenative distances and replace the existing distances if necessary.

Once all of A’s neighbors are considered, mark A as visited.


3. Again, pick the lowest-distance unvisited vertex from the entire graph. In this case, that’s vertex B. B only has one unvisited neighbor, vertex C. C’s tentative distance is 0.5 + 0.7 = 1.2, because 1.2 < ∞, replace C’s distance with 1.2. Also note C’s “previous” vertex as B. Mark B as visited.


4. Again, pick the lowest-distance unvisited vertex from the entire graph. In this case both vertices C and D have distances of 1.2 and are unvisited, so pick either one. Let’s pick C for this example. For each of C’s unvisited neighbors (E and F), compute their tentative distances and replace the existing distances if necessary:


  1. For E, its tentative distance is 1.2 + 0.5 = 1.7. Because this is not less than E’s existing distance of 1.5, do nothing.
  2. For F, its tentative distance is 1.2 + 2.5 = 3.7. Because 3.7 < ∞, replace F’s distance with 3.7. Also note F’s “previous” vertex as C.

Once all of C’s neighbors are considered, mark C as visited.


  1. Keep repeating this process until all vertices are marked as visited. Even at this point, however, you can stop and get the lowest-cost path from A to any vertex already marked as visited. For example, the lowest-cost path from A to C has a cost of 1.2 and is found by going from A-B-C. Note that you can construct this path by starting at the end vertex (C) and following the “previous” record to B, then following B’s “previous” record to A.

The assignment

Write a program that allows the user to read graph information from a text file that s/he specifies. Once the file is loaded, the user should be able to view all the vertices and edges (including weights) of the graph. (No need to do this graphically – although you are welcome to do so if you want!). The user should also be able to select any two vertices from the graph and see the cost of the optimal path between them, as well as the optimal path itself.


A B 0.5
A E 1.5
A D 1.2
B A 0.5
B C 0.7
C B 0.7
C E 0.5
C F 2.5
D A 1.2
D F 4.5
E A 1.5
E C 0.5
E F 0.5
F C 2.5
F D 4.5
F E 0.5 being an expert in online Java help and having gone through the Java queries of various students understand the problems of students across academic levels right from undergraduate to postgraduate. We cater to the needs to Java assignment and Java homework based on student’s requirements and his academic level.

import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;

public class MappingApp {
  public static void main(String[] args) {
    String filename = null;

    // use Scanner to let user input the file name to load
    Scanner scanner = new Scanner(;
    while (filename == null || filename.length() == 0) {
      System.out.print("Input the name of the file to load: ");
      filename = scanner.nextLine();

    // load the graph from the file
    Graph graph = new Graph();

    // display the graph

    // ask the user to input two vertices to calculate the shortest path
    String start = null, end = null;
    while (start == null || start.length() == 0) {
      System.out.print("Input the start vertex: ");
      start = scanner.nextLine();
    while (end == null || end.length() == 0) {
      System.out.print("Input the end vertex: ");
      end = scanner.nextLine();

    // run dijkstra's algorithm to display the shorted distance
    graph.dijkstra(start, end);

class Vertex {
  private String name;

  // the edges that start from this vertex
  private List<Edge> edges;

  // these are for dijkstra's algorithm
  private double distance;
  private boolean visited;
  private Vertex previous;

  public Vertex(String name) { = name;
    this.edges = new ArrayList<Edge>();

  public double getDistance() {
    return this.distance;

  public Vertex getPrevious() {
    return this.previous;

  // update the distance and set the previous vertex to the parameter
  public void updateDistance(Vertex previous, double value) {
    this.previous = previous;
    this.distance = value;

  public String getName() {

  // add an edge for this vertex. if such an edge already exist, 
  // then update the old weight with the
  // weight in the parameter.
  public boolean addEdge(Edge e) {
    for (int i = 0; i < edges.size(); i++) {
      Edge old = this.edges.get(i);
      if (old.getEnd().getName().equals(e.getEnd().getName())) { // found
        this.edges.set(i, e); // update the weight
        return false;

    this.edges.add(e); // not found
    return true;

  public List<Edge> getEdges() {
    return this.edges;

  public void setVisited(boolean v) {
    this.visited = v;

  public boolean visited() {
    return this.visited;

class Edge {
  private Vertex start;
  private Vertex end;
  private double weight;

  public Edge(Vertex start, Vertex end, double weight) {
    this.start = start;
    this.end = end;
    this.weight = weight;

  public Vertex getStart() {
    return this.start;

  public Vertex getEnd() {
    return this.end;

  public double getWeight() {
    return this.weight;

class Graph {
  private List<Vertex> vertices;
  private List<Edge> edges;

  public Graph() {
    vertices = new ArrayList<Vertex>();
    edges = new ArrayList<Edge>();

  public void dijkstra(String start, String end) {
    // check whether start and end are in the graph
    Vertex startVertex = findVertex(start, false);
    Vertex endVertex = findVertex(end, false);

    if (startVertex == null || endVertex == null) {
      System.out.printf("Vertex %s or %s does not exist in the graph!\n", start, end);

    // prepare the data for dijktra algorithm
    for (Vertex v : this.vertices) {
      v.updateDistance(null, Double.POSITIVE_INFINITY);

    startVertex.updateDistance(null, 0);
    Vertex curr;

    while ((curr = closest()) != null) {
      if (curr == endVertex) { // already found

      // otherwise, update the vertices that this vertex has edges with
      for (Edge e : curr.getEdges()) {
        Vertex next = e.getEnd();
        if (curr.getDistance() + e.getWeight() < next.getDistance()) {
          // smaller distance, update
          next.updateDistance(curr, curr.getDistance() + e.getWeight());

    // now dijkstra is done, display the path
    if (endVertex.visited()) {
      System.out.printf("Shortest distance from %s to %s: %.1f\n", start, end, endVertex.getDistance());
      displayPath(startVertex, endVertex);
    } else {
      System.out.printf("%s cannot reach %s.\n", start, end);

  // recursively display the path
  private void displayPath(Vertex start, Vertex end) {
    if (start == end) {
    } else {
      displayPath(start, end.getPrevious());
      System.out.printf(" -> %s", end.getName());

  // find the vertex that has the smallest distance but still not visited
  private Vertex closest() {
    Vertex close = null;
    double distance = Double.POSITIVE_INFINITY;
    for (Vertex v : this.vertices) {
      if (!v.visited() && v.getDistance() < distance) {
        distance = v.getDistance();
        close = v;
    return close;

  public void loadFromFile(String filename) {
    // load the graph information from the given file
    // use a scanner to scan the file
    Scanner scanner = null;
    try {
      scanner = new Scanner(new FileInputStream(filename));
      while (scanner.hasNext()) { // process line by line
        String start =;

        if (start.length() == 0) {
          // End of file: this is the last empty line in the file

        // read end vertex and weight
        String end =;
        double weight = scanner.nextDouble();

        // add the edge to this graph
        addEdge(start, end, weight);
    } catch (IOException e) {
      System.out.println("Could not read file: " + filename);
    } finally {
      if (scanner != null) { // close the file

  // add the edge to this graph
  private void addEdge(String start, String end, double weight) {
    Vertex startVertex = findVertex(start, true);
    Vertex endVertex = findVertex(end, true);

    Edge edge = new Edge(startVertex, endVertex, weight);
    if (startVertex.addEdge(edge)) { // new edge

  // find the vertex with the given name in the graph
  // if this name does not exist yet and addNew is true, append a new vertex into the list of vertices
  private Vertex findVertex(String name, boolean addNew) {
    for (Vertex v : vertices) {
      if (v.getName().equals(name)) {
        return v; // found
    if (addNew) {
      // not found, construct one
      Vertex v = new Vertex(name);
      return v;

    return null;

  public String toString() {
    StringBuilder builder = new StringBuilder();

    builder.append("------------------ Vertices ------------------\n");
    for (Vertex v : this.vertices) {
      builder.append(v.getName() + "\n");

    builder.append("------------------   Edges  ------------------\n");
    for (Edge e : this.edges) {
      builder.append(e.getStart().getName() + " " + e.getEnd().getName() + " " + e.getWeight() + "\n");

    return builder.toString();

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As mentioned earlier, Java is among the most widely used programming languages today. According to our experts, every organization, government agency, enterprise, business, etc. uses Java in its daily activities in one way or the other. This is because, Java is used to develop almost every software program we come across today. Here are the most common applications of Java:

  • Embedded systems
  • Desktop GUI applications
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  • Mobile applications
  • Application servers and web servers
  • Scientific applications
  • Enterprise applications

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  • Java is cross-functional and portable. When you write a program in one platform using Java, you can still run the program on other platforms like embedded systems, mobile devices, and desktops.
  • Java is object-oriented, supports multithreading, offers network and multimedia support and it is distributed. Additionally, the programming language is free and simple to use.
  • Having been in the market for a long time, Java has matured into a more predictable and stable language. With a rich class library, it is easy for developers to create cross-platform programs with Java.
  • Java is highly popular at network, embedded, and enterprise level, which means that it has a wide user base and consequently, an efficient customer support.
  • Java has robust application development tools. For instance, its NetBeans and Eclipse SDK features provide an integrated development environment and offer debugging capabilities.
  • Java is a diverse language. Scala, JRuby, Groovy and Clojure are excellent examples of the language’s compatibility with other computing languages.

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Learn features of Java from the best programming experts

The main idea behind the development of Java was to make a program that was secure, simple, and portable. Apart from this, developers of Java added some other awesome features to the programming language, which has greatly influenced the popularity of the language. Below are some of the most important Java buzzwords:

  • Simple: Java is one of the easiest programming languages to learn and understand. According to our experts, the simplicity of Java is attributed to its simple C++ based syntax that is easy to use, removal of rarely used features such as operator overloading, explicit pointers etc., and the presence of Automatic Garbage Collection feature that automatically removes unreferenced objects.
  • Object-oriented: If a programming language is object-oriented, it means that programs are developed by combining different objects consisting of data and behavior. Java combines all features of object-oriented programing such as object, class, inheritance, encapsulation, abstraction, and polymorphism, to simplify the process of software development and maintenance.
  • Platform independent: A platform can be defined as the software or hardware environment where a program runs. Java code can run anywhere. It is supported by numerous platforms including Windows, Mac/OS, Sun Solaris, Linux, etc.
  • Security: Java is one of the most secure programming languages. Its Security Manager, Bytecode Verifier, and Classloader features allow developers to create virus-free systems.
  • Powerful: Java uses powerful memory management tools. The language also lacks pointers that could bring security problems. These two features make Java a robust computing language.
  • Portable: Java allows you to transfer its bytecode to any platform. It is a Write Once Run Anywhere (WORA) programming language.
  • Multi-threaded: A thread is a separate program that executes concurrently. With Java, we can define multiple threads to perform multiple tasks. Multi-threading is a great way to save memory space as all threads share a common memory location.

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The difference between Java and C++

Another programming language that has been quite popular in the world of software developers is C++. We have realized that both Java and C++ assignments are some of the areas in which students often seek assistance with their assignments. And Programming Assignments being a reputed company, our experts have conducted extensive research to find out the major differences between the two in order to understand how to go about each subject when completing assignments for students in the two areas.

Java C++
Platform-independent Platform dependent
Mainly used to develop mobile, enterprise, web-based, and desktop applications Widely used for developing systems’ programs
Does not support operator overloading Supports operators overloading
Uses both a compiler and interpreter to translate code to machine language Uses only a compiler
Does not support unions and structures Supports unions and structures
Supports multi-threading Does not support multi-threading
Does not support go-to statement Supports go-to statements

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