Kajian 4: avent listener

• ActionListener

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame;   public class ThreadPertama {   public static void main(String[] args) {   JFrame frame = new JFrame();   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   frame.setSize(300, 200);   frame.setLayout(new FlowLayout());   final JButton button = new JButton();   button.setText("Start!");   button.addActionListener(new ActionListener() {    @Override    public void actionPerformed(ActionEvent arg0) {     // TODO Auto-generated method stub     new Thread() {      public void run() {       for (int i = 0; i < 50; i++) {        // system.out.println(i+"A");        button.setText(i + "A");        try {         Thread.sleep(300);        } catch (InterruptedException e) {         e.printStackTrace();         // TODO: handle exception        }       }      };     }.start();    }   });   frame.add(button);   final JButton button2 = new JButton();   button2.setText("Click!");   button2.addActionListener(new ActionListener() {    @Override    public void actionPerformed(ActionEvent arg0) {     // TODO Auto-generated method stub     new Thread() {      public void run() {       for (int j = 0; j < 50; j++) {        // System.out.println(i + "A");        button2.setText(j + "B");        try {         Thread.sleep(300);        } catch (InterruptedException e) {         // TODO: handle exception         e.printStackTrace();        }       }      };     }.start();    }   });   frame.add(button2);   frame.setVisible(true);  } }

• MouseListener

import java.awt.FlowLayout; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.util.Random; import javax.swing.JButton; import javax.swing.JFrame;   public class MyFrame {   public static void main(String[] args) {   final JFrame frame = new JFrame("Mouse Listener");   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   frame.setSize(300, 300);   frame.setLocationRelativeTo(null);   frame.setLayout(new FlowLayout());   final JButton button = new JButton("click");   button.addMouseListener(new MouseListener() {    @Override    public void mouseReleased(MouseEvent arg0) {     // TODO Auto-generated method stub    }    @Override    public void mousePressed(MouseEvent arg0) {     // TODO Auto-generated method stub    }    @Override    public void mouseExited(MouseEvent arg0) {     // TODO Auto-generated method stub    }    @Override    public void mouseEntered(MouseEvent arg0) {     // TODO Auto-generated method stub     Random random = new Random();     int x = Math.abs(random.nextInt(frame.getWidth()) - button.getWidth());     int y = Math.abs(random.nextInt(frame.getHeight()) - button.getHeight());     button.setLocation(x, y);    }    @Override    public void mouseClicked(MouseEvent arg0) {     // TODO Auto-generated method stub    }   });   frame.add(button);   frame.setVisible(true);  } }

• Mouse Motion Listener

Interface MouseMotionListener mendukung MouseListener. Menyediakan method-method yang akan memantau pergerakan mouse,seperti drag dan pemindahan mouse. MouseMotionListener mempunyai dua method untuk diimplementasikan.

import java.awt.*; import java.awt.event.*; public class MouseClick {   Label lbl;   public static void main(String[] args) {   MouseClick MC = new MouseClick();   }   public MouseClick(){   Frame f = new Frame("Checking the mouse click");   Panel p = new Panel();   Button button = new Button("Click Me");   button.addMouseListener(new MyMouseListener());   p.add(button, BorderLayout.NORTH);   f.add(p,BorderLayout.NORTH);   lbl = new Label("Roseindia.net");   f.add(lbl, BorderLayout.CENTER);   f.addWindowListener(new WindowAdapter(){   public void windowClosing(WindowEvent we){   System.exit(0);   }   });   f.setSize(400,400);   f.setVisible(true);   }     public class MyMouseListener extends MouseAdapter{   public void mouseClicked(MouseEvent me){   String str = lbl.getText();   if (str.equals("Roseindia.net")){   lbl.setText("You have clicke the button.");   }   else if (str.equals("You have clicke the button.")){   lbl.setText("Roseindia.net");   }   }   }