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我正在写RiverRaidlike游戏，并且我在重新启动游戏时遇到问题。如何在Java中重新启动游戏
当工艺崩溃时，我想让它能够按空间并重新启动游戏。
问题是我已经在JPanel上绘制了一切。
我的研究：
当我尝试一个游戏对象传递给Panel类和处理的最后一个窗口有一个NullPointerException ...
private void restart() { game.dispose(); new Game(); repaint(); }我认为这是与调用构造函数的问题..但我不知道...
当我尝试重新初始化JPanel它只是repai NTS所有，但犯规删除旧的内容
private void initBoard() { addKeyListener(new TAdapter()); setFocusable(true); setBackground(Color.PINK); setLayout(new GridBagLayout()); craft = new Craft(ICRAFT_X, ICRAFT_Y); setMinimumSize(new Dimension(WIDTH, HEIGHT)); initEnemiesAndAddThem(); czas = new Timer(delay, this); czas.start(); } private void initEnemiesAndAddThem() { enemy = new EnemyJet(0, -600); enemies.add(enemy); fuel = new Fuel(0, 0); fuels.add(fuel); obstacle = new Obstacle(0, -600); obst.add(obstacle); } private void restart() { initBoard(); }最后，当我试图实现的KeyListener它不工作在所有...试图打印出一个字符串当我按下空间的JFrame，但没有任何反应。 ..
我所能做的就是停止定时器并重新启动它，但它暂停游戏但不重新启动它。
这些都是JFrame类和JPanel类：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package riverraid2;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
/**
*
* @author Michał
*/
public class Game extends JFrame implements KeyListener {
private final static int WIDTH = 1024;
private final static int HEIGHT = 768;
Plansza panel;
Game() {
initGame();
}
private void initGame() {
Plansza panel = new Plansza();
setTitle("Reeevah Raaid");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(WIDTH, HEIGHT);
setPreferredSize(new Dimension(WIDTH, HEIGHT));
setMinimumSize(new Dimension(800, 600));
setMaximumSize(new Dimension(1680, 1050));
setLocationRelativeTo(null);
// panel.setState(new StartScreen(panel));
this.add(panel, BorderLayout.CENTER);
pack();
setVisible(true);
//setExtendedState(JFrame.MAXIMIZED_BOTH);
//setResizable(false);
}
public static void main(String[] args) {
new Game();
//ex.setVisible(true);
// ex.pack();
}
@Override
public void keyTyped(KeyEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
@Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_SPACE) {
System.out.print("Spacja!");
}
}
@Override
public void keyReleased(KeyEvent e) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package riverraid2;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.geom.AffineTransform;
import javax.swing.JPanel;
import javax.swing.Timer;
import java.util.ArrayList;
import javax.swing.Icon;
import javax.swing.JLabel;
/**
*
* @author Michał
*/
public class Plansza extends JPanel implements ActionListener {
private boolean paused = false;
private int ileWcisniec = 0;
private int slowDownSally = 0;
private int finalScore = 1;
private Game game;
private Timer czas;
private Thread thread;
private Craft craft;
private Fuel fuel;
private Obstacle obstacle;
private EnemyJet enemy;
private final int delay = 10;
private final int ICRAFT_X = 450;
private final int ICRAFT_Y = 600;
private final ArrayList<Fuel> fuels = new ArrayList<>();
private final ArrayList<EnemyJet> enemies = new ArrayList<>();
private final ArrayList<Obstacle> obst = new ArrayList<>();
boolean running = true;
long licznik = System.nanoTime();
public Plansza() {
// setBackground(Color.WHITE);
initBoard();
}
private void initBoard() {
addKeyListener(new TAdapter());
setFocusable(true);
setBackground(Color.PINK);
setLayout(new GridBagLayout());
craft = new Craft(ICRAFT_X, ICRAFT_Y);
setMinimumSize(new Dimension(WIDTH, HEIGHT));
initEnemiesAndAddThem();
czas = new Timer(delay, this);
czas.start();
}
private void initEnemiesAndAddThem() {
enemy = new EnemyJet(0, -600);
enemies.add(enemy);
fuel = new Fuel(0, 0);
fuels.add(fuel);
obstacle = new Obstacle(0, -600);
obst.add(obstacle);
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
doDrawing(g);
if (!running) {
drawGameOver(g, "");
g.drawString("Press SPACE to restart the game!", getWidth()/4, getHeight()/2);
}
Toolkit.getDefaultToolkit().sync();
}
private void doDrawing(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
drawStrings(g2);
ArrayList ms = craft.getMissiles();
for (Object m1 : ms) {
Missile m = (Missile) m1;
g2.drawImage(m.getImage(), m.getX(), m.getY(), this);
}
g2.drawImage(craft.getImage(), craft.getX(), craft.getY(), this);
for (EnemyJet enemy : enemies) {
g2.drawImage(enemy.getImage(), enemy.getX(), enemy.getY(), this);
}
for (Fuel fuel : fuels) {
g2.drawImage(fuel.getImage(), fuel.getX(), fuel.getY(), fuel.getHeight(), fuel.getHeight(), this);
}
for (Obstacle o : obst) {
g2.drawImage(o.getImage(), o.getX(), o.getY(), this);
}
drawStrings(g2);
}
private void drawGameOver(Graphics g, String msg) {
Font small = new Font("Helvetica", Font.BOLD, 36);
FontMetrics fm = getFontMetrics(small);
g.setColor(Color.white);
g.setFont(small);
g.drawString("GAME OVER", getWidth()/4, (getHeight()/2)-50);
g.drawString(msg, (1024 - fm.stringWidth(msg))/2,
800/2);
}
public void drawStrings(Graphics2D g) {
String score;
String fuelString;
score = "Score: " + finalScore;
g.setColor(Color.WHITE);
g.setFont(new Font("Consolas", Font.PLAIN, 48));
g.drawString(score, 150, 48);
fuelString = "Fuel: " + craft.getFuel();
g.drawString(fuelString, 650, 48);
}
public String gameOver() {
String msg = "";
if (craft.getFuel() <= 0) {
running = false;
msg = "Zabrakło ci paliwa!";
}
if (finalScore == 1000000) {
running = false;
msg = "Gra ukończona, jesteś mistrzem River Raid, oto Twój medal Mistrza River Raid";
}
return msg;
}
private void restart()
{
initBoard();
}
@Override
public void actionPerformed(ActionEvent e) {
removeAll();
gameRunning();
updateMissiles();
updateCraft();
updateEnemy();
updateFuel();
updateObstacles();
checkCollision();
gameOver();
if (slowDownSally % 100 == 0) {
updateArrays();
}
if (finalScore % 2000 == 0) {
levelUpJets();
}
repaint();
slowDownSally++;
}
public boolean gameState()
{
return running;
}
private void updateMissiles() {
ArrayList ms = craft.getMissiles();
for (int i = 0; i < ms.size(); i++) {
Missile m = (Missile) ms.get(i);
if (m.isVisible()) {
m.move();
} else {
ms.remove(i);
}
}
}
private void updateArrays() {
EnemyJet e = new EnemyJet(0, -600);
enemies.add(e);
Fuel f = new Fuel(0, -500);
fuels.add(f);
Obstacle o = new Obstacle(0, -600);
obst.add(o);
}
private void updateEnemy() {
for (int i = 0; i < enemies.size(); i++) {
EnemyJet e = enemies.get(i);
if (e.isVisible()) {
e.move();
} else {
enemies.remove(i);
}
}
}
private void updateFuel() {
for (int i = 0; i < fuels.size(); i++) {
Fuel e = fuels.get(i);
if (e.isVisible()) {
e.move();
} else {
fuels.remove(i);
}
}
}
private void updateObstacles() {
for (int i = 0; i < obst.size(); i++) {
Obstacle o = obst.get(i);
if (o.isVisible()) {
o.move();
} else {
obst.remove(i);
}
}
}
private void updateCraft() {
craft.move();
}
public void gameRunning() {
if (running == false) {
czas.stop();
}
}
void checkCollision() {
Rectangle r3 = craft.getBounds();
for (EnemyJet enemy : enemies) {
Rectangle r2 = enemy.getBounds();
if (r3.intersects(r2)) {
craft.setVisible(false);
enemy.setVisible(false);
running = false;
}
}
ArrayList<Missile> ms = craft.getMissiles();
for (Missile m : ms) {
Rectangle r1 = m.getBounds();
for (EnemyJet enemy : enemies) {
Rectangle r2 = enemy.getBounds();
if (r1.intersects(r2)) {
m.setVisible(false);
enemy.setVisible(false);
enemy.vis = false;
finalScore += 100;
}
}
}
for (Fuel fuel : fuels) {
Rectangle r4 = fuel.getBounds();
if (r3.intersects(r4)) {
craft.addFuel(50);
fuel.setVisible(false);
}
}
for (Obstacle o : obst) {
Rectangle r5 = o.getBounds();
for (Missile m : ms) {
Rectangle r1 = m.getBounds();
if (r1.intersects(r5)) {
m.setVisible(false);
}
}
if(r5.intersects(r3))
{
running = false;
}
}
}
private void levelUpJets() {
for (EnemyJet e : enemies) {
e.levelUp();
}
}
private class TAdapter extends KeyAdapter {
@Override
public void keyReleased(KeyEvent e) {
craft.keyReleased(e);
}
@Override
public void keyPressed(KeyEvent e) {
craft.keyPressed(e);
restart();
}
}
}
这不是NullPointerException异常的问题，但我想更多的概念性问题，了解如何重新开始比赛......我只是建议我尝试之一给出了这个错误，但是我做了这个努力以显示在解决方案中找到的努力。
作为一个sidenode。您目前尝试重新启动“游戏”基本上是重新启动整个应用程序（'new Game（）'在您的'main'中调用）。至少这不是重启它的最有利的解决方案。我可能会尝试将变量重置为初始化的默认值来表示新的“游戏”。 – SomeJavaGuy
好的，但如何使它成为图像？如何将其全部删除并重新初始化？ – tdbr
配置主框架;创建一个新的。显示它。你似乎在名为'game'的实例变量上调用'dispose（）'。然后你创建一个'新的Game（）'，但不要将它分配给任何东西。这显然是错误的。 –