Gui问题
主类与监听接口import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class SimpleGuiB implements ActionListener {
JButton colorbutton;
JFrame frame;
JButton lablebutton;
JLabel label;
public static void main(String [] args){
SimpleGuiB gui = new SimpleGuiB();
gui.go();
}public void go(){
frame = new JFrame();
JP jp = new JP();
label = new JLabel("I am a lable!");
lablebutton = new JButton("click here");
colorbutton = new JButton("Change Circle");
colorbutton.addActionListener(this);
lablebutton.addActionListener(new testbutton());
frame.getContentPane().add(BorderLayout.SOUTH,colorbutton);
frame.getContentPane().add(BorderLayout.WEST,label);
frame.getContentPane().add(BorderLayout.NORTH,lablebutton);
frame.getContentPane().add(BorderLayout.CENTER,jp);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500,500);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent event){
frame.repaint();
}
class testbutton implements ActionListener{
public void actionPerformed(ActionEvent event){
lablebutton.setText("我已经被按过了");
label.setText("ouch");
}
}
}
设置Circle渐变颜色的类
import javax.swing.*;
import java.awt.*;
public class JP extends JPanel {
public void paintComponent(Graphics graphics){
Graphics2D g2d = (Graphics2D)graphics;
int red = (int)(Math.random()*255);
int green = (int)(Math.random()*255);
int blue = (int)(Math.random()*255);
Color starColor = new Color(red, green, blue);
red = (int)(Math.random()*255);
green = (int)(Math.random()*255);
blue = (int)(Math.random()*255);
Color endColor = new Color(red, green, blue);
GradientPaint gradient = new GradientPaint(70,70,starColor,150,150,endColor);
g2d.setPaint(gradient);
g2d.fillOval(70,70,100,100);
/*Image image = new ImageIcon("壁纸") .getImage();
graphics.drawImage(image,3,4,this);*/
}
}
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
图丢了补一下
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