我的JAR文件没有运行，我遇到了一个神秘的问题。我的游戏打开一个JFrame对象，其中显示所有图形。一切都在Eclipse中工作，但是当我尝试将完成的游戏导出为Runnable JAR文件，然后从我的桌面双击它时，没有任何反应。我没有收到错误消息或任何内容，我的JFrame没有弹出，所以没有游戏可玩。
我确保我的课程中没有任何错误或警告，但仍然无法打开JFrame。此外，当我右键单击桌面上所谓的Runnable JAR文件，然后转到属性，然后单击表示安全性的选项卡时，SYSTEM下的允许类别下面都有复选标记。
这是我的主要类，如果你需要它，虽然我怀疑实际编码有问题，因为它在Eclipse中工作正常，它只是不能从我的桌面打开：
package com.wierd0games.Under.main;
import java.awt.Canvas;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.util.Random;
import javax.swing.JFrame;
import com.wierd0games.Under.graphics.Draw;
import com.wierd0games.Under.graphics.Sprite;
import com.wierd0games.Under.graphics.SpriteSheet;
import com.wierd0games.Under.input.Keyboard;
import com.wierd0games.Under.mobs.Frog;
import com.wierd0games.Under.mobs.Healthbar;
public class Main extends Canvas implements Runnable {
private static final long serialVersionUID=1L;
public static final int WIDTH=300;
public static final int HEIGHT=WIDTH*9/16;
public static final int SCALE=3;
private JFrame frame;
private boolean running=false;
private Thread thread;
private Draw draw;
private Keyboard keyboard;
private int frames;
private int updates;
private final long TIME_BETWEEN_UPDATES=1000000000/60;
BufferedImage image=new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
int[] pixels=((DataBufferInt)image.getRaster().getDataBuffer()).getData();
Frog frog;
private int[] sideCollisions=new int[0];
private int[] verticalCollisions=new int[0];
private final int WATER_LEVEL=1600;
private Generator generator;
private Healthbar healthbar;
private int score=0;
private int time=60;
private int lastScore=0;
private int lastTimeAlive=0;
private int room=0;
private int counter=0;
private Sprite openingScreenToDraw=new Sprite(1, 1, 300, SpriteSheet.backgrounds);
Random random=new Random();
public static void main(String[] args) {
Main game=new Main();
game.frame.setResizable(false);
game.frame.setTitle("Under | FPS: --- Updates: --");
game.frame.add(game);
game.frame.pack();
game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
game.frame.setLocationRelativeTo(null);
game.frame.setVisible(true);
game.start();
}
private Main() {
frame=new JFrame();
Dimension size=new Dimension(WIDTH*SCALE, HEIGHT*SCALE);
frame.setPreferredSize(size);
keyboard=new Keyboard();
addKeyListener(keyboard);
draw=new Draw(WIDTH, HEIGHT, pixels);
frog=new Frog(0, 1632, 0.01, .98, .94, .94, WATER_LEVEL, keyboard);
generator=new Generator(WATER_LEVEL);
healthbar=new Healthbar(frog.MAX_HUNGER, frog.MAX_BREATH, (int)(frog.MAX_JUMP_CHARGE*100)-40);
}
private void update() {
if (room==0) {
if (++counter>300) {
room=1;
counter=-60;
openingScreenToDraw=Sprite.titleScreen;
}
else {
if (counter>120&&counter<280) {
for (int i=0; i<openingScreenToDraw.pixels.length; i++) {
if (openingScreenToDraw.pixels[i]!=0) {
if (random.nextInt((300-counter-20))==0) {
openingScreenToDraw.pixels[i]=0;
}
}
}
}
}
}
if (room==1) {
keyboard.update();
if (++counter>=0) {
if (counter>40) {
counter=0;
if (openingScreenToDraw==Sprite.titleScreen) {
openingScreenToDraw=Sprite.titleScreen2;
}
else {
openingScreenToDraw=Sprite.titleScreen;
}
}
if (keyboard.keysPressed[10]) {
room=2;
counter=0;
}
}
}
if (room==2) {
if (++counter>=60) {
counter=0;
time--;
}
keyboard.update();
for (int i=0; i<keyboard.keys.length; i++) {
if (keyboard.keysPressed[i]) {
System.out.println("Key "+i+" Pressed");
}
}
int[] returned=generator.update((int)frog.x, (int)frog.y);
int fliesToEat=returned[0];
int chestsToCollect=returned[1];
score+=fliesToEat*10+chestsToCollect*100;
frog.update(sideCollisions, verticalCollisions, fliesToEat);
healthbar.update(frog.hunger, frog.breath, (int)(frog.jumpCharge*100)-40);
draw.update(((int)frog.x+(frog.WIDTH+frog.BLANK_LEFT)/2)*-1+WIDTH/2, ((int)frog.y+(frog.HEIGHT+frog.BLANK_TOP)/2)*-1+HEIGHT/2);
sideCollisions=generator.getSideCollisions();
verticalCollisions=generator.getVerticalCollisions();
if (frog.hunger<=0) {
room=3;
counter=0;
lastScore=score;
lastTimeAlive=60-time;
score=0;
time=60;
frog=new Frog(0, 1632, 0.01, .98, .94, .94, WATER_LEVEL, keyboard);
generator=new Generator(WATER_LEVEL);
healthbar=new Healthbar(frog.MAX_HUNGER, frog.MAX_BREATH, (int)(frog.MAX_JUMP_CHARGE*100)-40);
}
if (frog.breath<=0) {
room=4;
counter=0;
lastScore=score;
lastTimeAlive=60-time;
score=0;
time=60;
frog=new Frog(0, 1632, 0.01, .98, .94, .94, WATER_LEVEL, keyboard);
generator=new Generator(WATER_LEVEL);
healthbar=new Healthbar(frog.MAX_HUNGER, frog.MAX_BREATH, (int)(frog.MAX_JUMP_CHARGE*100)-40);
}
if (time<=0) {
room=5;
counter=0;
lastScore=score;
lastTimeAlive=60-time;
score=0;
time=60;
frog=new Frog(0, 1632, 0.01, .98, .94, .94, WATER_LEVEL, keyboard);
generator=new Generator(WATER_LEVEL);
healthbar=new Healthbar(frog.MAX_HUNGER, frog.MAX_BREATH, (int)(frog.MAX_JUMP_CHARGE*100)-40);
}
}
if (room==3) {
keyboard.update();
if (keyboard.keysPressed[10]) {
room=1;
}
}
if (room==4) {
keyboard.update();
if (keyboard.keysPressed[10]) {
room=1;
}
}
if (room==5) {
keyboard.update();
if (keyboard.keysPressed[10]) {
room=1;
}
}
if (room==6) {
keyboard.update();
if (keyboard.keysPressed[10]) {
room=1;
}
}
}
private void render() {
BufferStrategy bs=getBufferStrategy();
if (bs==null) {
createBufferStrategy(3);
return;
}
for (int i=0; i<pixels.length; i++) {//sets the background color to white so that the clouds don't have holes in them
pixels[i]=-1;
}
if (room==0) {
draw.drawSpriteToScreen(0, 0, openingScreenToDraw);
}
if (room==1) {
draw.drawSpriteToScreen(0, 0, openingScreenToDraw);
}
if (room==2) {
draw.drawSpriteToScreen(0, Math.min(0, -1*(int)frog.y+WATER_LEVEL-HEIGHT/2-2), Sprite.sky);
draw.drawSpriteToScreen(0, Math.max(0, -1*(int)frog.y+HEIGHT+WATER_LEVEL-HEIGHT/2-2), Sprite.water);
frog.drawSelf(draw);
generator.drawBlocks(draw);
healthbar.drawSelf(draw, score, time);
}
if (room==3) {
draw.drawSpriteToScreen(0, 0, Sprite.youStarved);
draw.drawNumberToScreen(80, 64, lastScore);
draw.drawNumberToScreen(117, 79, lastTimeAlive);
}
if (room==4) {
draw.drawSpriteToScreen(0, 0, Sprite.youDrowned);
draw.drawNumberToScreen(80, 64, lastScore);
draw.drawNumberToScreen(117, 79, lastTimeAlive);
}
if (room==5) {
draw.drawSpriteToScreen(0, 0, Sprite.outOfTime);
draw.drawNumberToScreen(80, 64, lastScore);
draw.drawNumberToScreen(117, 79, lastTimeAlive);
}
if (room==6) {
draw.drawSpriteToScreen(0, 0, Sprite.youWereEaten);
draw.drawNumberToScreen(80, 64, lastScore);
draw.drawNumberToScreen(117, 79, lastTimeAlive);
}
Graphics g=bs.getDrawGraphics();
g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
g.dispose();
bs.show();
}
private synchronized void start() {
running=true;
thread=new Thread(this, "Under");
thread.start();
}
private synchronized void stop() {
running=false;
try {
thread.join();
}
catch (InterruptedException e) {
e.printStackTrace();
}
}
public void run() {
long lastNanoTime=System.nanoTime();
long lastMilliTime=System.currentTimeMillis();
updates=0;
frames=0;
requestFocus();
while (running) {
long currentNanoTime=System.nanoTime();
while (currentNanoTime-lastNanoTime>=TIME_BETWEEN_UPDATES) {
lastNanoTime+=TIME_BETWEEN_UPDATES;
update();
updates++;
}
render();
frames++;
while (lastMilliTime+1000<System.currentTimeMillis()) {
lastMilliTime+=1000;
frame.setTitle("Under | FPS: "+frames+" Updates: "+updates);
updates=0;
frames=0;
}
}
stop();
}
}
以下是可以下载JAR的链接： https://sites.google.com/site/wierd0games/ludum-dare-under
答案 0 :(得分：2)
抛出的异常是：
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.wierd0games.Under.graphics.Sprite.<clinit>(Sprite.java:13)
at com.wierd0games.Under.main.Main.<init>(Main.java:53)
at com.wierd0games.Under.main.Main.main(Main.java:57)
Caused by: java.lang.IllegalArgumentException: input == null!
at javax.imageio.ImageIO.read(ImageIO.java:1388)
at com.wierd0games.Under.graphics.SpriteSheet.load(SpriteSheet.java:27)
at com.wierd0games.Under.graphics.SpriteSheet.<init>(SpriteSheet.java:22)
at com.wierd0games.Under.graphics.SpriteSheet.<clinit>(SpriteSheet.java:13)
... 3 more
如果在命令行上使用java -jar Under-LD.jar运行jar，则可以看到异常。
答案 1 :(得分：1)
您是否在run config中选择了主类。
运行＆gt;运行配置＆gt;主类＆gt;选择你的主要课程。 接下来清理并再次构建。然后在项目的dist文件夹中打开jar文件。