将线程与油漆 java 一起使用

Question

我正在用 Java 开发跳棋游戏，但偶然发现了一个问题。 我正在尝试创建的是，当按下棋盘格时，它前面的可用 2 个点应变为灰色 2 秒。

变灰很容易，但是当我希望它在 2 秒后使用 Thread.sleep(2000) 变回时，我注意到它在实际睡眠之前首先在此开关中完成其余的情况（所以它把新鲜的灰色方块立即变回黑色）

出了什么问题？提前致谢！

switch (bord[ypos][xpos]) {
                case 0:

                    break;
                case 1:

                    break;
                case 2:

                    if (bord[ypos + 1][xpos - 1] == 1) {
                        bord[ypos + 1][xpos - 1] = 4;

                    }
                    if (bord[ypos + 1][xpos + 1] == 1) {
                        bord[ypos + 1][xpos + 1] = 4;

                    }
                    repaint();
                    try {
                        Thread.sleep(2000);
                    } catch (InterruptedException e) {
                    }
                    if (bord[ypos + 1][xpos - 1] == 4) {
                        bord[ypos + 1][xpos - 1] = 1;
                    }
                    if (bord[ypos + 1][xpos + 1] == 4) {
                        bord[ypos + 1][xpos + 1] = 1;
                    }
                    break;
                case 3:

                    break;
            }

用计时器试试（我是新手，所以请不要用力捂脸）

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package dammen;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 *
 * @author Boyen
 */
public class Board extends JPanel implements MouseListener {

    boolean test;
    boolean black = false;
    boolean redpiece = false;
    boolean bluepiece = true;
    Timer timer;
    private int[][] bord = {{0, 2, 0, 2, 0, 2, 0, 2},
        {2, 0, 2, 0, 2, 0, 2, 0},
        {0, 2, 0, 2, 0, 2, 0, 2},
        {1, 0, 1, 0, 1, 0, 1, 0},
        {0, 1, 0, 1, 0, 1, 0, 1},
        {3, 0, 3, 0, 3, 0, 3, 0},
        {0, 3, 0, 3, 0, 3, 0, 3},
        {3, 0, 3, 0, 3, 0, 3, 0}};

    public Board(Dammen parent) {
        addMouseListener(this);
        timer = new Timer(100,taskPerformer);
        timer.setRepeats(false);
    }

    public void start() {
    }

    public void paint(Graphics g) {
        super.paint(g);

        Dimension size = getSize();

        for (int i = 0; i < 8; i++) {
            for (int j = 0; j < 8; j++) {
                switch (bord[i][j]) {
                    case 0:
                        g.setColor(Color.WHITE);
                        break;
                    case 1:
                        g.setColor(Color.BLACK);
                        break;
                    case 2:
                        g.setColor(Color.RED);
                        break;
                    case 3:
                        g.setColor(Color.BLUE);
                        break;
                    case 4:
                        g.setColor(Color.gray);
                        break;
                }
                g.fillRect((size.width / 8) * j, (size.height / 8) * i, size.width / 8, size.height / 8);
            }

        }
    }
    int mouseX, mouseY;

    @Override
    public void mouseClicked(MouseEvent e) {


        mouseX = e.getX();
        mouseY = e.getY();

        zoekmogelijkespots(mouseX, mouseY);

    }
    ActionListener taskPerformer = new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {

        }
  };

    public void zoekmogelijkespots(int mouseX, int mouseY) {

            Dimension size = getSize();
            System.out.println(mouseX + "," + mouseY);
            int xpos;
            int ypos;
            xpos = (int) (mouseX / (size.width / 8));
            ypos = (int) (mouseY / (size.height / 8));
            System.out.println(ypos + "," + xpos);
            System.out.println(bord[ypos][xpos]);
            switch (bord[ypos][xpos]) {
                case 0:

                    break;
                case 1:

                    break;
                case 2:

                    if (bord[ypos + 1][xpos - 1] == 1) {
                        bord[ypos + 1][xpos - 1] = 4;

                    }
                    if (bord[ypos + 1][xpos + 1] == 1) {
                        bord[ypos + 1][xpos + 1] = 4;

                    }
                    repaint();
                    timer.start();
                    if (bord[ypos + 1][xpos - 1] == 4) {
                        bord[ypos + 1][xpos - 1] = 1;
                    }
                    if (bord[ypos + 1][xpos + 1] == 4) {
                        bord[ypos + 1][xpos + 1] = 1;
                    }
                    break;
                case 3:

                    break;
            }


    }

    @Override
    public void mousePressed(MouseEvent e) {
    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
    }

    @Override
    public void mouseExited(MouseEvent e) {
    }
}

Answer 1

你可以使用 Swing javax.swing.Timer 来实现你想要的......

if (bord[ypos + 1][xpos - 1] == 1) {
    bord[ypos + 1][xpos - 1] = 4;
}
if (bord[ypos + 1][xpos + 1] == 1) {
    bord[ypos + 1][xpos + 1] = 4;
}
repaint();
Timer timer = new Timer(2000, new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
        if (bord[ypos + 1][xpos - 1] == 4) {
            bord[ypos + 1][xpos - 1] = 1;
        }
        if (bord[ypos + 1][xpos + 1] == 4) {
            bord[ypos + 1][xpos + 1] = 1;
        }
    }
});
timer.setRepeats(false);
timer.start();

Answer 2

除了Thread.sleep(2000);，你可以这样做（注意，我无法测试这个）：

public static class GrayWorker extends SwingWorker<Object, Object> {
    private final int xpos;
    private final int ypos;
    private final int[][] bord;
    public GrayWorker(int[][] bord, int xpos, int ypos) {
        this.bord = bord; this.xpos = xpos; this.ypos = ypos;
    }

    @Override
    public Object doInBackground() {
        Thread.sleep(2000);
        return null;
    }

    @Override
    protected void done() {
        if (bord[ypos + 1][xpos - 1] == 4) {
            bord[ypos + 1][xpos - 1] = 1;
        }
        if (bord[ypos + 1][xpos + 1] == 4) {
            bord[ypos + 1][xpos + 1] = 1;
        }
    }
}

然后，在你的另一堂课上，做：

GrayWorker worker = new GrayWorker(bord, xpos, ypos);
worker.execute();