因此，当我运行此代码时，我的JFrame变得无法响应。我设法将它追溯到gameLoop（）下的while循环。无论使用调用Thread.sleep（）的延迟（1000 / FRAMERATE），它都不允许Key或Mouse Listener完成他们的工作。
下面的完整代码，gameLoop（）中存在问题
package me.LemmingsGame;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class Game extends JFrame implements KeyListener, MouseListener{
private World wrld;//reference to current world
private WorldFile loader=null;//world data
private int gateCounter;
private int width,height; //width and height of level
private int mx,my;
private int tool = Lemming.CLIMB;
private Image dbImage; private Graphics dbg; //backbuffer
private Image [] sprites;//all images used in game
private Lemming[] lemmings; //array of all Lemmings in level
private int nextLem;//next Lemming to be received from Gate class
private int running;//state of game
private static final int FRAMERATE=180;//assigned framerate
public Game(WorldFile loader){
super("Lemmings");
setLocation(50,40);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setResizable(false);
width=3+loader.x*10;height=29+loader.y*10;
loadImages();
lemmings=new Lemming[loader.noLemmings*loader.gates().length];
setSize(width,height);
setVisible(true);
addMouseListener(this);
addKeyListener(this);
this.loader=loader;
running=2;
dbImage= createImage(width,height);
dbg=dbImage.getGraphics();
wrld=new World(loader,createImage(width,height), sprites, this);
gameLoop();
}
public void loadImages(){
sprites=new Image[2];
sprites[0]=new ImageIcon("Resources/toolbar.png").getImage();
sprites[1]=new ImageIcon("Resources/selector.png").getImage();
}
public static void delay(long len){
try{
Thread.sleep(len);
}catch(InterruptedException e){
System.out.println(e);
}
}
public void moveLemmings(){
if(nextLem>0)
for(int i = 0;i<nextLem;i++)
lemmings[i].cycle();
}
public void gameLoop(){
wrld.openGates();
while(running>0){
delay(1000/FRAMERATE);
if(running==2){
gateCounter++;
if(gateCounter>FRAMERATE*2){
wrld.cycleGates();
gateCounter=0;
}
moveLemmings();
if(nextLem>0)
wrld.checkPositions(lemmings,nextLem);
}
repaint();
//paint(getGraphics());
}
}
public void paint(Graphics g){
if(wrld!=null){
dbg.setColor(Color.BLACK);
dbg.fillRect(0, 0, width, height);
wrld.draw(dbg);
if(nextLem>0)
for(int i=0;i<nextLem;i++){
lemmings[i].draw(dbg);
}
dbg.drawImage(sprites[0],0,0,null);
dbg.drawImage(sprites[1],tool-3*39,0,null);
g.drawImage(dbImage,3,29,this);
}
}
public void addLemming(Lemming lemmy) {
lemmings[nextLem]=lemmy;
lemmy.spawn();
nextLem++;
}
public void goal(){
running=0;
dispose();
new Menu();
}
public void fail(){
running=0;
dispose();
new Menu();
}
public void mouseClicked(MouseEvent e) {}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void keyTyped(KeyEvent e) {}
public void mousePressed(MouseEvent e) {
System.out.println("boop");
mx=e.getX();
my=e.getY();
if(my<40)
if(mx<40)
tool=Lemming.CLIMB;
else if(mx>39&&mx<=39*2)
tool=Lemming.CHUTE;
}
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public void keyPressed(KeyEvent e) {
System.out.println("boop2");
}
public void keyReleased(KeyEvent e) {
}
}
如果重要的是程序从这里开始并进入游戏类
package me.LemmingsGame;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.*;
public class Menu extends JFrame implements ActionListener{
/**
*
*/
private static final long serialVersionUID = -1448646591011984524L;
private JComboBox worldList;
private JButton launch, worldEditor;
private String [] worldPaths;
private String [] worldNames;
private int currentWorld;
public Menu(){
super("Lemmings! By: Jordan and Seth");
this.setLocation(new Point(550,400));
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
File listDir[] = new File("./Worlds").listFiles();
int x=0;
for (int i = 0; i < listDir.length; i++)
if (listDir[i].isDirectory())
x++;
worldPaths=new String[x];
worldNames=new String[x];
x=0;
for (int i = 0; i < listDir.length; i++)
if (listDir[i].isDirectory()){
worldPaths[x]=listDir[i].getPath().substring(2);
worldNames[x]=worldPaths[x].substring(7);
x++;
}
worldList=new JComboBox(worldNames);
worldList.addActionListener(this);
worldEditor=new JButton("Open World Editor");
worldEditor.addActionListener(this);
launch = new JButton("Play");
launch.addActionListener(this);
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(worldEditor);
cp.add(worldList);
cp.add(launch);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==worldEditor){
dispose();
new MapEditor();
}else if(e.getSource()==launch){
dispose();
try {
new Game(new WorldFile(worldPaths[currentWorld]));
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}else if(e.getSource()==worldList){
currentWorld=worldList.getSelectedIndex();
}
}
public static void main(String [] args){
new Menu();
}
}
可能不相关，但这里是github repo https://github.com/cybnetsurfe3011/Lemmings-Computer-Science/的插件
答案 0 :(得分：2)
您正在主线程中执行Thread.sleep()，在这种情况下是EDT（事件调度程序线程）。该线程负责绘制图形和监听事件。通过Thread.sleep()，你实际上是暂停它，因此不允许它做它的工作。
您似乎希望每隔一段时间刷新一次GUI（至少这是我猜的）。如果是这种情况，您需要将逻辑移动到一个新的单独线程，然后从您将要生成的线程中调用您需要的更新方法。要使更改可见，您需要使用SwingUtilities.invokeLater()方法再次调用事件调度程序线程。