我试图制作随机字母,但只能包含三个字母,并且我想在按下“随机”按钮时在创建的窗口中逐一显示它们,但是当我按下随机按钮时,循环没有停下来。并以与CLI尝试相同的方式给了我预期的结果。我已经尝试了很多次,但是没有用。请帮忙吗?
以下是我程序的完整源代码:
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;
}
}
}
}
以及以下是我在CLI中尝试的代码:
package testGrafik;
import java.util.Random;
public class TestRandomCLI {
public static void main(String[] args) {
char[] character = {'S', 'O', 'I'};
Random rand = new Random();
char c = character[rand.nextInt(character.length)];
String convertString = String.valueOf(c);
System.out.println("Latter: " + convertString);
}
}
答案 0 :(得分:1)
发生这种情况是因为您在JComponent#repaint()
中调用了JComponent#paintComponent()
方法。当您呼叫repaint()
时,将呼叫paintComponent
。再一次,repaint()
将被称为...,您明白了。
解决方案:
用户单击时,仅呼叫repaint()
1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");
}
}
当然要从paintComponent()
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();
}