发布时间 : 2024/5/29 20:07:25 星期三 文章Java图形界面程序设计更新完毕开始阅读a9fd7060caaedd3383c4d37b

b2.setActionCommand(\ f.add(b1,\ f.add(b2,\ f.pack(); f.setVisible(true); } }

class Monitor2 implements ActionListener {

public void actionPerformed(ActionEvent e) { System.out.println(e.getActionCommand()); } }

实例2

import java.awt.*;

import java.awt.event.*;

public class MultiListenerTest implements MouseMotionListener,MouseListener { Frame f = new Frame(\多重监听器测试\ TextField tf = new TextField(30); public MultiListenerTest(){ Label l = new Label(\请按下鼠标左键并拖动\ f.add(l, \ f.add(tf, \ f.setBackground(new Color(180,225,225)); f.addMouseMotionListener(this); f.addMouseListener(this); f.setSize(300, 200); f.setVisible(true); }

public static void main(String args[]) { MultiListenerTest t = new MultiListenerTest(); }

public void mouseDragged(MouseEvent e) {

String s = \鼠标拖动到位置（\ \ tf.setText(s); }

public void mouseEntered(MouseEvent e) { tf.setText(\鼠标已进入窗体\ }

public void mouseExited(MouseEvent e) { tf.setText(\鼠标已移出窗体\ }

public void mouseMoved(MouseEvent e) { }

public void mousePressed(MouseEvent e) { } public void mouseClicked(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } }

3、 源代码：

import java.awt.Graphics; import javax.swing.JPanel;

public class Draw3DRect extends JPanel{ public void paint(Graphics g){

g.draw3DRect(60, 50, 70, 30, true); } }

import java.awt.Graphics; import javax.swing.JPanel;

public class DrawLine extends JPanel{ public void paint(Graphics g){ g.drawLine(60,50, 70, 30); } }

//主函数

import java.awt.Graphics; import javax.swing.JPanel;

public class DrawOval extends JPanel{ public void paint(Graphics g){ g.drawOval(60,50, 70, 30); } }

import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.Panel; import java.awt.Toolkit;

import java.awt.event.ActionEvent; import java.awt.event.ActionListener;

import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel;

public class DrawMain extends JFrame

implements ActionListener{ /**

* @param args */

private JButton oval = new JButton(\椭圆形\ private JButton line = new JButton(\直形\ private JButton rect = new JButton(\矩形\ private Panel p = new Panel(); private JPanel jp = null;

public DrawMain(){ }

private void jbInit() throws Exception{

this.getContentPane().setLayout(new BorderLayout()); p.setLayout(new GridLayout(1,3)); p.add(line); p.add(rect); p.add(oval);

this.add(p,BorderLayout.NORTH); this.setTitle(\图画板\ this.setSize(600,600); this.setVisible(true); Dimension

screenSize

=

Toolkit.getDefaultToolkit().getScreenSize(); Dimension frameSize = this.getSize(); if(frameSize.height > screenSize.height){ }

if(frameSize.width > screenSize.height){ }

this.setLocation((screenSize.width-frameSize.width)/2,(screenSize.height-frameSize.height)/2); this.setVisible(true);

frameSize.width = screenSize.width; frameSize.height = screenSize.height; try{ }

jbInit();

}catch(Exception e){

e.printStackTrace();

line.addActionListener(this); oval.addActionListener(this); rect.addActionListener(this); }

public void actionPerformed(ActionEvent e){

if(e.getSource() == oval){ }

if(jp != null){ this.remove(jp); if(jp != null){ }

jp = new DrawOval();

this.getContentPane().add(jp,BorderLayout.CENTER); this.setVisible(true); System.out.println(132654);

this.remove(jp);

if(e.getSource() == rect){

}

}

jp = new Draw3DRect();

this.getContentPane().add(jp,BorderLayout.CENTER); this.setVisible(true);

if(e.getSource() == line){ }

public static void main(String[] args) { }

}

DrawMain drawmain = new DrawMain();

}

}

jp = new DrawLine();

this.getContentPane().add(jp,BorderLayout.CENTER); this.setVisible(true);

if(jp != null){ this.remove(jp);

五、实验过程中遇到的问题及解决手段： 六、本次实验的体会（结论）：实验让我更深刻的体会到java语言。