Gui问题

之朝百

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

之朝百

图丢了补一下

点击前

点击后