尽管frage.setDefaultCloseperation（）

Question

我遇到了一个问题，即面板不加载jframe，而jframe本身也没有设置默认关闭操作，而是执行setSize（）和setVisible（）。我尝试在Main，run（）方法和帧的构造函数中运行帧初始化，没有区别。 MouseListeners似乎没有功能，但是如果没有将面板添加到框架中，就无法确定知道，这不是。我发布此问题的主要目标是在单击X时使框架关闭，并将面板再次添加到框架中。我敢肯定，在gamestate.buffer（）或gamestae.paint（g）中，这不是问题。这是用于猪飞行时的电子游戏。这是代码：

主类：

package when.pigs.fly;

public class Main {
    static Frame frame;
    public static void main(String[] args) {
        frame=new Frame();
        frame.panel.run();
    }
}

帧类：

package when.pigs.fly;

import javax.swing.JFrame;

public class Frame extends JFrame{
    Panel panel;
    int windowWidth,windowHeight;
    public Frame(){
        super("When Pigs Fly");
        
        panel=new Panel();
        panel.setListeners();
        
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(1000,600);
        buffer();
        
        add(panel);
        setVisible(true);
    }
    
    public final void buffer(){
        windowWidth=getContentPane().getWidth();
        windowHeight=getContentPane().getHeight();
    }
}

面板类：

package when.pigs.fly;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JPanel;
import static when.pigs.fly.GameState.gameState;
import static when.pigs.fly.Main.frame;

public class Panel extends JPanel implements MouseListener,MouseMotionListener{
    private long timeElapsed;
    int mouseX,mouseY;
    boolean mouseDown;
    
    public Panel(){
        gameState=new GameState(1);
    }
    
    public final void setListeners(){
        addMouseListener(this);
        addMouseMotionListener(this);
    }
    
    public void run(){
        boolean run=true;
        while(run){
            long timeAtStart=System.nanoTime();
            
            if(timeElapsed>=33333333){
                gameState.buffer();
                frame.buffer();
                timeElapsed-=33333333;
            }
            repaint();
            
            timeElapsed+=System.nanoTime()-timeAtStart;
        }
    }
    
    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        gameState.paint((Graphics2D)g);
    }
    
    @Override
    public void mouseClicked(MouseEvent me) {
        
    }

    @Override
    public void mousePressed(MouseEvent me) {
        mouseDown=true;
    }

    @Override
    public void mouseReleased(MouseEvent me) {
        mouseDown=false;
    }

    @Override
    public void mouseEntered(MouseEvent me) {}

    @Override
    public void mouseExited(MouseEvent me) {}

    @Override
    public void mouseDragged(MouseEvent me) {
        mouseX=me.getX();
        mouseY=me.getY();
    }

    @Override
    public void mouseMoved(MouseEvent me) {
        mouseX=me.getX();
        mouseY=me.getY();
    }

}

Answer 1

怀疑比比皆是，但我怀疑，根据您的描述，您的运行方法正在阻止事件派遣线程。

秋千是单线螺纹，而不是线程安全。这意味着您不应在事件派发线程的上下文中长时间运行或阻止代码，并且您不应更新UI或UI依赖于事件派遣线程的任何状态。

参见 Swing 同意的同意。

一个简单的解决方案是使用 swing> swing timer ，例如...

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;

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

    public Main() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        private Timer timer;
        private int mouseX, mouseY;
        private boolean mouseDown;

        public TestPane() {
            MouseHandler handler = new MouseHandler();
            addMouseListener(handler);
            addMouseMotionListener(handler);
        }

        protected void start() {
            if (timer != null) {
                return;
            }
            timer = new Timer(5, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    // Check input
                    // Update game state
                    repaint();
                }
            });
            timer.start();
        }

        protected void stop() {
            if (timer == null) {
                return;
            }
            timer.stop();
            timer = null;
        }

        @Override
        public void addNotify() {
            super.addNotify();
            start();
        }

        @Override
        public void removeNotify() {
            super.removeNotify();
            stop();
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(1000, 600);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            int dotSize = 6;
            if (mouseDown) {
                g2d.setColor(Color.RED);
                g2d.fillOval(mouseX - dotSize, mouseY - dotSize, dotSize * 2, dotSize * 2);
            } else {
                g2d.setColor(Color.BLACK);
                g2d.drawOval(mouseX - dotSize, mouseY - dotSize, dotSize * 2, dotSize * 2);
            }
            g2d.dispose();
        }

        protected class MouseHandler extends MouseAdapter {

            @Override
            public void mousePressed(MouseEvent me) {
                mouseDown = true;
            }

            @Override
            public void mouseReleased(MouseEvent me) {
                mouseDown = false;
            }

            @Override
            public void mouseDragged(MouseEvent me) {
                mouseX = me.getX();
                mouseY = me.getY();
            }

            @Override
            public void mouseMoved(MouseEvent me) {
                mouseX = me.getX();
                mouseY = me.getY();
            }
        }

    }
}