文件名称：java多态作业
文件大小：47KB
文件格式：DOCX
更新时间：2016-07-06 14:24:27
多态
java多态import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ComplexListener implements MouseMotionListener,MouseListener,ActionListener{ JFrame f; JTextArea tf; JButton bt; int number = 1; public ComplexListener(){ JLabel label =new JLabel("click and Drag the mouse"); f=new JFrame ("Complex Listener"); tf=new JTestArea(); bt= new JButton("退出"); tf.addMouseMotionListener(this); tf.addMouseListener(this); bt.addActionListener(this); f.add(label,BorderLayout.NORTH); f.add(tf,BorderLayout.CENTER); f.add(bt,BorderLayout.SOUTH); f.setSize(300,200); f.setVisible(true); //MouseMotionListener的方法 public void mouseDragged(MouseEvent e){ String s=number+++""+"The mouse Dragged:x="+ e.getX()+"y="+e.getY()+"\n"; tf.append(s); } //MouseMotionListener的方法 public void mouseEntered(MouseEvent e){ String s=number+++""+"The mouse entered"+"\n"; tf.append(s); } public void mouseClicked(MouseEvent e){ String s=number+++""+"The mouse clicked."+"\n"; tf.append(s); } public void mouseExited(MouseEvent e){ String s=number+++""+"The mouse exit."+"\n"; tf.append(s); } //未使用的MouseMotionListener的方法 public void mouseMoved(MouseEvent e){ } //未使用的MouseListener的方法 public void mouseReleased(MouseEvent e){ } public void mousePressed(MouseEvent e){ } //ActionListener的方法 public void actionPerformed(ActionEvent e){ System.exit(0); public static void main(String args[]){ ComplexListener two = new ComplexListener(); } }