circle

public class CirclePanel extends JPanel
{
    //* Deklarasi atribut
    private int number;
   
    //* Constructor
    public CirclePanel()
    {
       
    }
   
    //* Method accessor dan mutator untuk mengubah nilai atribut
    public void setNumber(int number)
    {
        this.number=number;
    }
   
    public int getNumber()
    {
        return number;
    }
   
    //* Method untuk membuat lingkaran, dengan instruksi bersyarat
    @Override
    public void paintComponent(Graphics graph)
    {
        super.paintComponent(graph);
        if(number%2==0)
            graph.setColor(Color.GREEN);
        else
            graph.setColor(Color.WHITE);
           
        graph.fillOval(20,10,200,200);
    }
}

public class CircleCounter extends Thread {
    //* Deklarasi atribut

    private JTextField textField;
    private JButton starStop;
    Thread thread;
    private boolean counter = false;
    private int number = 0;
    CirclePanel circlePanel;

    //* Constructor
    public CircleCounter() {
    }

    public CircleCounter(JTextField textField, JButton starStop, CirclePanel circlePanel) {
        this.textField = textField;
        this.starStop = starStop;
        this.circlePanel = circlePanel;
    }

    //* Method menjalankan Thread
    public void startCircleCounter() {
        thread = new Thread(this);

        if (counter == false) {
            thread.start();
            counter = true;
            starStop.setText("Stop");
        } else {
            counter = false;
            starStop.setText("Start");
        }
    }

    //* Eksekusi ketika thread dijalankan
    @Override
    public void run() {
        while (counter) {
            number = number + 1;
            textField.setText(String.valueOf(number));
            try {
                thread.sleep(500);
                circlePanel.setNumber(number);
                circlePanel.repaint();
            } catch (InterruptedException ex) {
                ex.printStackTrace();
            }
        }
    }
}


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CircleCounterGUI extends JFrame
{
    //* Deklarasi atribut
    private JPanel mainPanel;
    private JTextField textField;
    private JButton startStopButton;
    private CirclePanel circlePanel;
    private boolean condition=true;
    CircleCounter circleCounter;
   
    public CircleCounterGUI()
    {
        //* mengatur frame
        this.setLocation(100,100);
        this.setSize(600,300);
        this.setLayout(new BorderLayout());
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("Circle Green & White");
       
        //* membuat container beserta komponennya, kemudian memasukkannya pada container
        Container container=this.getContentPane();
        container.setLayout(new GridLayout(0,2));
       
        mainPanel=new JPanel();
        mainPanel.setLayout(new FlowLayout());
        startStopButton=new JButton("Start");
        textField=new JTextField(10);
        textField.setEditable(false);
        mainPanel.add(startStopButton);
        mainPanel.add(textField);
        container.add(mainPanel);
       
        circlePanel=new CirclePanel();
        container.add(circlePanel);
       
        //* penanganan pada tombol startStopButton
        startStopButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e)
            {
                randomCircleAction();
            }
        });
    }
   
    //* method untuk memulai counter/menghitung dan menampilkan lingkaran berwarna
    public void randomCircleAction()
    {
        if(condition)
        {
            circleCounter=new CircleCounter(textField, startStopButton, circlePanel);
            circleCounter.startCircleCounter();
            condition=false;
        }
        else
        {
            circleCounter.startCircleCounter();
            condition=true;
        }
    }
}


package pertemuan13_pbo;

public class CircleCounterGUI_Test
{
    public static void main(String [] args)
    {
        //* Menjalankan fungsi thread dari kelas CircleCounterGUI dan menampilkannya
        CircleCounterGUI test=new CircleCounterGUI();
        test.setVisible(true);
    }
}