制作随机字符字母并在JavaSwing中逐个显示

我试着创建随机字母，但只有三个字母，我想在按下随机按钮时创建的窗口中逐个显示它们，但当我按下随机按钮时，循环没有停止。同样，我尝试使用CLI，它给了我预期的结果。我试过很多次了，但都不起作用。请帮忙

下面是我的程序的完整源代码：

package testGrafik;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class TestRandom extends JFrame {

public TestRandom() {
    setTitle("Test Game");
    setSize(500, 500);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);

    Board board = new Board();
    getContentPane().add(board);
}

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

public class Board extends JPanel implements MouseListener, 
MouseMotionListener {
    int x;
    int y;
    public boolean isMouseMoving = false;
    public boolean isClicked = false;

    public char[] character = {'S', 'O', 'I'};
    public Random rand = new Random();

    public Board() {
        x = 0;
        y = 0;

        addMouseListener(this);
        addMouseMotionListener(this);
    }

    @Override
    public void paintComponent(Graphics g) {
        g.setColor(Color.DARK_GRAY);
        g.fillRect(x, y, 500, 500);

        // draw box
        g.setColor(Color.LIGHT_GRAY);
        g.fillRect(x + 10, y + 10, 70, 40);

        if (isMouseMoving == true) {
            g.setColor(Color.cyan);
            g.fillRect(x + 10, y + 10, 70, 40);
        }

        //draw string
        g.setColor(Color.BLACK);
        g.setFont(new Font("Tahoma", Font.BOLD, 15));
        g.drawString("Click", x + 25, y + 35);

        if (isClicked == true) {
            char c = character[rand.nextInt(character.length)];
            String convertString = String.valueOf(c);

            g.setColor(Color.WHITE); // border color
                g.setFont(new Font("Tahoma", Font.PLAIN, 30)); // 
    String.valueOf(hrf)
                g.drawString(convertString, x + 500 / 2, y + 500 / 2); // 
border boax t4 huruf muncul
                System.out.println("Latter: " + convertString); 
            }
            repaint();
        }

        @Override
        public void mouseClicked(MouseEvent e) {
            int mx = e.getX();
            int my = e.getY();

            if (mx > x + 10 && mx < x + 10 + 70 && my > y + 10 && my < y + 
10 + 40) {
                isClicked = true;
                System.out.println("YOU CKLIK ON THE BOX");
            } else {
                isClicked = false;
                System.out.println("You click outside the box");
            }
        }

        @Override
        public void mousePressed(MouseEvent e) {
        }

        @Override
        public void mouseReleased(MouseEvent e) {
        }

        @Override
        public void mouseEntered(MouseEvent e) {
        }

        @Override
        public void mouseExited(MouseEvent e) {
        }

        @Override
        public void mouseDragged(MouseEvent e) {
        }

        @Override
        public void mouseMoved(MouseEvent e) {
            int mx = e.getX();
            int my = e.getY();

            if (mx > x + 10 && mx < x + 10 + 70 && my > y + 10 && my < y + 
10 + 40) {
                isMouseMoving = true;
            } else {
                isMouseMoving = false;
            }
        }
    }
}

---

发生这种情况是因为您在JComponentpaintComponent内调用了JComponentrepaint方法。调用repaint时，将调用paintComponent。然后，再次调用“重新绘制”，你就明白了

解决方案：

当用户单击时，仅调用repaint一次

@Override
public void mouseClicked(MouseEvent e) {
    int mx = e.getX();
    int my = e.getY();

    if (mx > x + 10 && mx < x + 10 + 70 && my > y + 10 && my < y + 10 + 40) {
        isClicked = true;
        System.out.println("YOU CKLIK ON THE BOX");
        repaint(); //Only 1 call after call
    } else {
        isClicked = false;
        System.out.println("You click outside the box");
    }
}

---

@wenda，绘画方法不应该改变类的属性。这意味着你不应该使用兰德。。。方法中的方法。相反，您需要一个类似GeneratorDomainLetters的方法，当您单击按钮时将调用该方法。然后将类的属性设置为随机字符串，paintComponent方法将简单地喘息字符串。移除重新绘制方法将阻止组件自动重新绘制自身，但您仍然无法控制Swing何时确定组件需要重新绘制。

@Override
public void mouseClicked(MouseEvent e) {
    int mx = e.getX();
    int my = e.getY();

    if (mx > x + 10 && mx < x + 10 + 70 && my > y + 10 && my < y + 10 + 40) {
        isClicked = true;
        System.out.println("YOU CKLIK ON THE BOX");
        repaint(); //Only 1 call after call
    } else {
        isClicked = false;
        System.out.println("You click outside the box");
    }
}

 if (isClicked == true) {
        char c = character[rand.nextInt(character.length)];
        String convertString = String.valueOf(c);

        g.setColor(Color.WHITE); // border color
            g.setFont(new Font("Tahoma", Font.PLAIN, 30)); // 
            g.drawString(convertString, x + 500 / 2, y + 500 / 2); // 
            System.out.println("Latter: " + convertString); 
        }
        //repaint();
    }