我尝试了很多方法来为以下代码添加一个按钮，该代码运行一个太空入侵者游戏，但都没有奏效。有人可以看看，看看是否有解决方案？
先感谢您。
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferStrategy;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Game extends Canvas {
/** Image variables to be drawn */
Image imgLevel;
Image imgAliens;
Image img;
JFrame container;
private BufferStrategy strategy;
private boolean gameRunning = true;
private ArrayList entities = new ArrayList();
private ArrayList removeList = new ArrayList();
private Entity ship;
private double moveSpeed = 500;
private long lastFire = 0;
private long firingInterval;
private long ExtraFiringInterval = 100;
private long bombFiringInterval = 500;
private int alienCount;
private String message = "";
private boolean waitingForKeyPress = true;
private boolean leftPressed = false;
private boolean rightPressed = false;
private boolean upPressed = false;
private boolean downPressed = false;
private boolean firePressed = false;
private boolean fireExtraPressed = false;
private boolean bombFired = false;
private boolean logicRequiredThisLoop = false;
static int level = 8;
private int Armour;
Toolkit tk = Toolkit.getDefaultToolkit();
int xSize = ((int) tk.getScreenSize().getWidth());
int ySize = ((int) tk.getScreenSize().getHeight());
/**
* Construct our game and set it running.
*/
public Game() {
img = Toolkit.getDefaultToolkit().createImage("Bg.gif");
container = new JFrame("Space Invaders Mod");
container.setSize(xSize,ySize);
container.show();
JPanel panel = (JPanel) container.getContentPane();
panel.setSize(xSize, ySize);
panel.setLayout(null);
container.setSize(xSize, ySize);
setBounds(0,0,xSize,ySize);
panel.add(this);
setIgnoreRepaint(true);
container.pack();
container.setResizable(true);
container.setVisible(true);
container.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
addKeyListener(new KeyInputHandler());
requestFocus();
createBufferStrategy(2);
strategy = getBufferStrategy();
initEntities();
}
/**
* Start a fresh game, this should clear out any old data and
* create a new set.
*/
private void startGame() {
entities.clear();
initEntities();
leftPressed = false;
rightPressed = false;
upPressed = false;
downPressed = false;
firePressed = false;
fireExtraPressed = false;
bombFired = false;
firingInterval = 100;
}
/**
* Initialise the starting state of the entities (ship and aliens). Each
* entitiy will be added to the overall list of entities in the game.
*/
private void initEntities() {
ship = new ShipEntity(this,"sprites/ship.png",370,ySize - 130);
entities.add(ship);
alienCount = 0;
if (level == 1) {
Armour = 10;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
entities.add(alien3);
alienCount++;
}
}
}
if (level == 2) {
Armour = 20;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
}
}
}
if (level == 3) {
Armour = 30;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
}
}
}
if (level == 4) {
Armour = 40;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
}
}
}
if (level == 5) {
Armour = 50;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
}
}
}
if (level == 6) {
Armour = 60;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
}
}
}
if (level == 7) {
Armour = 70;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
Entity alien9 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(60)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
entities.add(alien9);
alienCount++;
}
}
}
if (level == 8) {
Armour = 80;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
Entity alien9 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(60)+row*30);
Entity alien10 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(70)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
entities.add(alien9);
alienCount++;
entities.add(alien10);
alienCount++;
}
}
}
if (level == 9) {
Armour = 90;
ExtraFiringInterval --;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
Entity alien9 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(60)+row*30);
Entity alien10 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(70)+row*30);
Entity alien11 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(80)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
entities.add(alien9);
alienCount++;
entities.add(alien10);
alienCount++;
entities.add(alien11);
alienCount++;
}
}
}
if (level == 10){
Armour = 100;
ExtraFiringInterval --;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
Entity alien9 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(60)+row*30);
Entity alien10 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(70)+row*30);
Entity alien11 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(80)+row*30);
Entity alien12 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(90)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
entities.add(alien9);
alienCount++;
entities.add(alien10);
alienCount++;
entities.add(alien11);
alienCount++;
entities.add(alien12);
alienCount++;
}
}
}
if (level == 11){
Armour = 110;
for (int row=0;row<1;row++) {
for (int x=0;x<25;x++) {
Entity alien3 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(00)+row*30);
Entity alien4 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(10)+row*30);
Entity alien5 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(20)+row*30);
Entity alien6 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(30)+row*30);
Entity alien7 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(40)+row*30);
Entity alien8 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(50)+row*30);
Entity alien9 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(60)+row*30);
Entity alien10 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(70)+row*30);
Entity alien11 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(80)+row*30);
Entity alien12 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(90)+row*30);
Entity alien13 = new AlienEntity(this,"sprites/alien.png",100+(x*50),(100)+row*30);
entities.add(alien3);
alienCount++;
entities.add(alien4);
alienCount++;
entities.add(alien5);
alienCount++;
entities.add(alien6);
alienCount++;
entities.add(alien7);
alienCount++;
entities.add(alien8);
alienCount++;
entities.add(alien9);
alienCount++;
entities.add(alien10);
alienCount++;
entities.add(alien11);
alienCount++;
entities.add(alien12);
alienCount++;
entities.add(alien13);
alienCount++;
}
}
}
}
public void updateLogic() {
logicRequiredThisLoop = true;
}
public void removeEntity(Entity entity) {
removeList.add(entity);
}
public void notifyDeath() {
message = "Oh no! They got you, try again?";
waitingForKeyPress = true;
level = 0;
}
public void notifyWin() {
message = "Well done! You beat level "+level;
waitingForKeyPress = true;
if (level == 10){
message = "Well done! You actually beat level 10. Good luck!!";
}
}
public void notifyAlienKilled() {
// reduce the alient count, if there are none left, the player has won!
alienCount = alienCount-1;
ShotEntity.death = false;
ShotEntityExtra.death = false;
if (alienCount == 0) {
notifyWin();
}
// if there are still some aliens left then they all need to get faster, so
// speed up all the existing aliens
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
if (entity instanceof AlienEntity) {
// speed up by 2%
entity.setHorizontalMovement(entity.getHorizontalMovement() * 1.02);
}
}
}
public void tryToFire() {
if (System.currentTimeMillis() - lastFire < firingInterval) {
return;
}
if (level > 6) {
lastFire = System.currentTimeMillis();
ShotEntity shot2 = new ShotEntity(this,"sprites/shot.png",ship.getX()+70,ship.getY()-30);
entities.add(shot2);
lastFire = System.currentTimeMillis();
ShotEntity shot3 = new ShotEntity(this,"sprites/shot.png",ship.getX()-30,ship.getY()-30);
entities.add(shot3);
}
if (level > 7){
lastFire = System.currentTimeMillis();
ShotEntity shot2 = new ShotEntity(this,"sprites/shot.png",ship.getX()+90,ship.getY()-30);
entities.add(shot2);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntity shot3 = new ShotEntity(this,"sprites/shot.png",ship.getX()-50,ship.getY()-30);
entities.add(shot3);
}
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntity shot = new ShotEntity(this,"sprites/shot.png",ship.getX()+20,ship.getY()-30);
entities.add(shot);
if (level > 3){
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntity shot2 = new ShotEntity(this,"sprites/shot.png",ship.getX()+50,ship.getY()-30);
entities.add(shot2);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntity shot3 = new ShotEntity(this,"sprites/shot.png",ship.getX()-10,ship.getY()-30);
entities.add(shot3);
}
}
public void tryToFireExtra() {
// check that we have waiting long enough to fire
if (System.currentTimeMillis() - lastFire < ExtraFiringInterval) {
return;
}
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra = new ShotEntityExtra(this,"sprites/shotExtra.png",ship.getX(),ship.getY()-30);
entities.add(shotExtra);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra2 = new ShotEntityExtra(this,"sprites/shotExtra.png",ship.getX()+50,ship.getY()-30);
entities.add(shotExtra2);
if (level == 9){
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra3 = new ShotEntityExtra(this,"sprites/shotExtra.png",ship.getX()+25,ship.getY()-30);
entities.add(shotExtra3);
}
if (level == 10){
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra3 = new ShotEntityExtra(this,"sprites/shotExtra.png", (int) (ship.getX()+12.5),ship.getY()-30);
entities.add(shotExtra3);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra4 = new ShotEntityExtra(this,"sprites/shotExtra.png", (int) (ship.getX()+37.5),ship.getY()-30);
entities.add(shotExtra4);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
ShotEntityExtra shotExtra5 = new ShotEntityExtra(this,"sprites/shotExtra.png", (int) (ship.getX()+25),ship.getY()-30);
entities.add(shotExtra5);
}
}
public void tryToFireBomb() {
// check that we have waiting long enough to fire
if (System.currentTimeMillis() - lastFire < bombFiringInterval) {
return;
}
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
Bomb bomb = new Bomb(this,"sprites/bomb.png",ship.getX(),ship.getY()-30);
entities.add(bomb);
// if we waited long enough, create the shot entity, and record the time.
lastFire = System.currentTimeMillis();
Bomb bomb2 = new Bomb(this,"sprites/bomb.png",ship.getX()+10,ship.getY()-30);
entities.add(bomb2);
}
public void gameLoop() {
long lastLoopTime = System.currentTimeMillis();
// keep looping round til the game ends
while (gameRunning) {
// work out how long its been since the last update, this
// will be used to calculate how far the entities should
// move this loop
long delta = System.currentTimeMillis() - lastLoopTime;
lastLoopTime = System.currentTimeMillis();
// Get hold of a graphics context for the accelerated
// surface and blank it out
Graphics2D g = (Graphics2D) strategy.getDrawGraphics();
//g.drawImage(img, 0, 0,xSize, ySize, null);
g.drawRect(0, 0, xSize, ySize);
g.fillRect(0, 0, xSize, ySize);
g.setColor(Color.BLACK);
// cycle round asking each entity to move itself
if (!waitingForKeyPress) {
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.move(delta);
}
}
// cycle round drawing all the entities we have in the game
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.draw(g);
}
// brute force collisions, compare every entity against
// every other entity. If any of them collide notify
// both entities that the collision has occured
for (int p=0;p<entities.size();p++) {
for (int s=p+1;s<entities.size();s++) {
Entity me = (Entity) entities.get(p);
Entity him = (Entity) entities.get(s);
if (me.collidesWith(him)) {
me.collidedWith(him);
him.collidedWith(me);
}
}
}
// remove any entity that has been marked for clear up
entities.removeAll(removeList);
removeList.clear();
// if a game event has indicated that game logic should
// be resolved, cycle round every entity requesting that
// their personal logic should be considered.
if (logicRequiredThisLoop) {
for (int i=0;i<entities.size();i++) {
Entity entity = (Entity) entities.get(i);
entity.doLogic();
}
logicRequiredThisLoop = false;
}
// if we're waiting for an "any key" press then draw the
// current message
if (waitingForKeyPress) {
g.setColor(Color.white);
g.drawString(message,(800-g.getFontMetrics().stringWidth(message))/2,250);
g.drawString("Press any key to start game",(800-g.getFontMetrics().stringWidth("Press any key to start game"))/2,300);
}
//score
g.setColor(Color.WHITE);
g.drawString("" + alienCount,10,10);
g.drawString(" Aliens left", 25, 10);
//level
g.setColor(Color.WHITE);
g.drawString("" + level,50,20);
g.drawString(" Level:", 10, 20);
// finally, we've completed drawing so clear up the graphics
// and flip the buffer over
g.dispose();