Gui问题

之朝百

主类与监听接口

1. 
   
2. import javax.swing.*;
   
3. import java.awt.*;
   
4. import java.awt.event.*;
   
5. 
   
6. public class SimpleGuiB implements ActionListener {
   
7.     JButton colorbutton;
   
8.     JFrame frame;
   
9.     JButton lablebutton;
   
10.     JLabel label;
    
11. 
    
12.     public static void main(String [] args){
    
13.         SimpleGuiB gui = new SimpleGuiB();
    
14.         gui.go();
    
15.     }public void go(){
    
16.         frame = new JFrame();
    
17.         JP jp = new JP();
    
18.         label = new JLabel("I am a lable!");
    
19. 
    
20.         lablebutton = new JButton("click here");
    
21.         colorbutton = new JButton("Change Circle");
    
22.         colorbutton.addActionListener(this);
    
23.         lablebutton.addActionListener(new testbutton());
    
24. 
    
25.         frame.getContentPane().add(BorderLayout.SOUTH,colorbutton);
    
26.         frame.getContentPane().add(BorderLayout.WEST,label);
    
27.         frame.getContentPane().add(BorderLayout.NORTH,lablebutton);
    
28.         frame.getContentPane().add(BorderLayout.CENTER,jp);
    
29.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
30.         frame.setSize(500,500);
    
31.         frame.setVisible(true);
    
32. 
    
33.     }
    
34.     public void actionPerformed(ActionEvent event){
    
35.         frame.repaint();
    
36.         }
    
37.     class testbutton implements ActionListener{
    
38.         public void actionPerformed(ActionEvent event){
    
39.             lablebutton.setText("我已经被按过了");
    
40.             label.setText("ouch");
    
41.         }
    
42.     }
    
43. }
    

复制代码

设置Circle渐变颜色的类

1. import javax.swing.*;
   
2. import java.awt.*;
   
3. 
   
4. public class JP extends JPanel {
   
5.     public void paintComponent(Graphics graphics){
   
6.         Graphics2D g2d = (Graphics2D)graphics;
   
7.         int red = (int)(Math.random()*255);
   
8.         int green = (int)(Math.random()*255);
   
9.         int blue = (int)(Math.random()*255);
   
10.         Color starColor = new Color(red, green, blue);
    
11. 
    
12.         red = (int)(Math.random()*255);
    
13.         green = (int)(Math.random()*255);
    
14.         blue = (int)(Math.random()*255);
    
15.         Color endColor = new Color(red, green, blue);
    
16. 
    
17.         GradientPaint gradient = new GradientPaint(70,70,starColor,150,150,endColor);
    
18.         g2d.setPaint(gradient);
    
19.         g2d.fillOval(70,70,100,100);
    
20.         /*Image image = new ImageIcon("壁纸") .getImage();
    
21.         graphics.drawImage(image,3,4,this);*/
    
22.     }
    
23. }
    

复制代码

基本结构就是，lablebutton（顶部按钮）的actionPerformed执行的是修改顶部按钮与右边面板的文字，可为啥点击后会导致圆圈的颜色发生变化，明明已经分开注册

之朝百

图丢了补一下

点击前

点击后