用jbutton更改颜色，将for循环终止条件设置为无限

Question

我正在为Uni进行课程作业，分配是用Jpanel创建一个矩形，但是我对创建的按钮有问题。

按钮应该执行以下操作：

用户点击南部地区的jbutton时填充有颜色的矩形应全部变为随机颜色，虽然填充有色2的矩形不应改变。一秒单击jbutton应该使矩形充满color2更改为随机颜色，而矩形充满了随机的颜色首次点击的颜色应保持相同的颜色。用户应该是能够继续无限地单击按钮，每次点击时一组矩形将充满随机颜色。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class RectanglesGUI {
    JFrame frame;
    RectangleDrawPanel drawPanel;
    Color color1 = Color.orange;
    Color color2 = Color.blue;

    public static void main (String[] args) {
        RectanglesGUI gui = new RectanglesGUI();
        gui.go();
    }
    //this method sets up the JFrame
    public void go() {
        frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        drawPanel = new RectangleDrawPanel();
        frame.getContentPane().add(BorderLayout.CENTER, drawPanel);
        frame.getContentPane().setBackground(Color.black);
        frame.setSize(600,600);
        frame.setVisible(true);
        CreateButton newButton = new CreateButton();
        newButton.CreateButton();
        frame.repaint();
    }
    // To Create a new Button
    public class CreateButton {
        JButton buttonSOUTH;
        JButton buttonNORTH;
        public void CreateButton () {
            buttonSOUTH = new JButton("Change Colors");
            buttonSOUTH.setPreferredSize(new Dimension(100, 50));
            buttonSOUTH.setVisible(true);
            frame.add(buttonSOUTH, BorderLayout.SOUTH);
            buttonSOUTH.addActionListener(new RandomColorListener());
            buttonNORTH = new JButton("Reset Colors");
            buttonNORTH.setPreferredSize(new Dimension(100, 50));
            buttonNORTH.setVisible(true);
            frame.add(buttonNORTH, BorderLayout.NORTH);
            buttonNORTH.addActionListener(new ResetListener());
        }
        // ActionListener for buttonSOUTH
        private class ResetListener implements ActionListener {
            @Override
            public void actionPerformed(ActionEvent e) {
                color1 = Color.orange;
                color2 = Color.blue;
                frame.repaint();
            }
        }
        // ActionListener for buttonNORTH
        private class RandomColorListener implements ActionListener {
            @Override
            public void actionPerformed(ActionEvent e) {
                ChangeColor c = new ChangeColor();
                for (int i = 0; i < 100; i++){
                    if (i % 2 == 0) {
                        color1 = c.getColor1();
                        frame.repaint();
                    } else {
                        color2 = c.getColor2();
                        frame.repaint();
                    }
                }
            }
        }

        // Change Color Class
        private class ChangeColor {
            private Color getColor1(){
                Random fill1 = new Random();
                color1 = new Color (fill1.nextInt(256), fill1.nextInt(256),
                        fill1.nextInt(256));
                return color1;
            }
            private Color getColor2(){
                Random fill2 = new Random();
                color2 = new Color (fill2.nextInt(256), fill2.nextInt(256),
                        fill2.nextInt(256));
                return color2;
            }
        }
    }
    class RectangleDrawPanel extends JPanel {
        public void paintComponent (Graphics g){
            super.paintComponent(g);
            Graphics2D g2=(Graphics2D)g;
            int width = getWidth();
            int height = getHeight();
            for (int i = 0; i < 5; i++) {
                for (int j = 0; j < 5; j++) {
                    int x = (getWidth() / 5) * i;
                    int y = (getHeight() / 5) * j;
                    if ((i % 2) == (j % 2)) {
                        g2.setColor(color1);
                    } else
                        g2.setColor(color2);
                    g2.fill3DRect(x,y,width,height,true);
                }
            }
        }
    }
}

，但我不知道如何将其设置为无限

for (int i = 0; i < 100; i++){
     if (i % 2 == 0) {
         color1 = c.getColor1();
         frame.repaint();
      } 
      else {
          color2 = c.getColor2();
          frame.repaint();
      }
}

Answer 1

此部分for (int i = 0; i < 100; i++)对检查没有用。
两者都将始终执行内部条件检查。这意味着color2和color1都会改变。因为我％2将返回0和1

将此属性添加到Rectanglegui类boolean status=false;
然后在类RandomColorListener中更改"方法"中的代码操作，为：

 if (status) {
      color1 = c.getColor1();
      frame.repaint();
 } else {
      color2 = c.getColor2();
      frame.repaint();
 }
  status=!status;