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所以我一直在嘗試着在Java中製作非常簡單的遊戲。當我在一堂課中製作整個課程時，我一直都很成功，但每當我嘗試添加面向對象原則時，一切都會崩潰。我想要的是從我的好人那裏發射一顆子彈，這或多或少是一個炮塔。我可以輕鬆地設置這樣的東西，但是當我嘗試用類代表好人和子彈時，所有東西都會分崩離析。 這是我到目前爲止。 設置了主程序框架：令人難以置信的簡單的Java遊戲任務使用OOP
import javax.swing.JFrame;
public class Shooter
{
public static void main (String[] args)
{
JFrame frame = new JFrame("Car");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ShooterPanel panel = new ShooterPanel();
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}
}
ShooterPanel類：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ShooterPanel extends JPanel
{
final int WIDTH = 200, HEIGHT = 100;
GoodGuy hero;
public ShooterPanel()
{
hero = new GoodGuy(0, HEIGHT-20, 20);
addKeyListener(new MoveListener());
setPreferredSize(new Dimension (WIDTH, HEIGHT));
setFocusable(true);
}
public void paintComponent(Graphics page)
{
super.paintComponent(page);
hero.draw(page);
}
private class MoveListener implements KeyListener
{
public void keyPressed (KeyEvent event)
{
switch (event.getKeyCode())
{
case KeyEvent.VK_SPACE:
hero.shoot();
break;
}
}
//--------------------------------------------------------------
//Provide empty definitions for unused event methods.
//--------------------------------------------------------------
public void keyTyped (KeyEvent event) {}
public void keyReleased (KeyEvent event) {}
}
}
我們的主角：
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class GoodGuy
{
private int x, y, size;
private Bullet bullet;
public GoodGuy(int x, int y, int height)
{
size = height;
this.x = x;
this.y = y;
}
public int getSize()
{
return size;
}
public void draw(Graphics page)
{
page.drawRect(x, y, size, size);
}
public void shoot()
{
bullet = new Bullet(x+size, y);
}
}
而他的子彈：
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class Bullet
{
private int x, y;
final int LENGTH = 5, DELAY =200;
private Timer timer;
Graphics page1;
public Bullet(int x, int y)
{
this.x = x;
this.y = y;
timer = new Timer(DELAY, new BulletListener());
timer.start();
}
public void draw(Graphics page)
{
page.drawLine (x, y, x+LENGTH, y);
}
//*****************************************************************
// Represents the action listener for the timer.
//*****************************************************************
private class BulletListener implements ActionListener
{
public void actionPerformed (ActionEvent event)
{
x +=5;
draw(page1);
}
}
}
我想即將發生 是爲了按下空格鍵，這個好人出現一顆子彈，並讓它在屏幕上向右移動。我根本無法得到子彈。我嘗試了幾件事，都無濟於事。我相信這很容易。正如我所說，我可以在我的ShooterPanel類中使用變量繪製子彈而不是創建對象，但我希望實現面向對象。有沒有人有我的解決方案？我將不勝感激一些幫助，但我正在尋找解決方案。請，如果你只是給出一個模糊的建議，我寧願沒有迴應。編輯：這是我希望我的程序如何工作：
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
public class ShooterPanel extends JPanel
{
final int WIDTH = 200, HEIGHT = 100;
GoodGuy hero;
ArrayList<BadGuy> enemies = new ArrayList<BadGuy>();
ArrayList<Bullet> bullets = new ArrayList<Bullet>();
private Timer timer, bulletTimer;
final int DELAY = 200;
int count=0;
private boolean bulletOut = false;
public ShooterPanel()
{
hero = new GoodGuy(0, HEIGHT-20, 20);
addKeyListener(new MoveListener());
timer = new Timer(DELAY, new EnemyListener());
bulletTimer = new Timer(100, new BulletListener());
setPreferredSize(new Dimension (WIDTH, HEIGHT));
//enemies.add(new BadGuy(WIDTH-10, HEIGHT-10));
setFocusable(true);
timer.start();
}
public void paintComponent(Graphics page)
{
super.paintComponent(page);
hero.draw(page);
for (int i = 0; i < enemies.size(); i++)
{
enemies.get(i).draw(page);
}
if (bulletOut)
for(Bullet bullet: bullets)
bullet.draw(page);
}
private class MoveListener implements KeyListener
{
//--------------------------------------------------------------
//Responds to the user pressing arrow keys by adjusting the
//image and image location accordingly.
//--------------------------------------------------------------
public void keyPressed (KeyEvent event)
{
switch (event.getKeyCode())
{
case KeyEvent.VK_SPACE:
bullets.add(new Bullet(20,95));
bulletOut = true;
bulletTimer.start();
break;
}
}
//--------------------------------------------------------------
//Provide empty definitions for unused event methods.
//--------------------------------------------------------------
public void keyTyped (KeyEvent event) {}
public void keyReleased (KeyEvent event) {}
}
//*****************************************************************
// Represents the action listener for the timer.
//*****************************************************************
private class EnemyListener implements ActionListener
{
//--------------------------------------------------------------
// Updates the position of the image and possibly the direction
// of movement whenever the timer fires an action event.
//--------------------------------------------------------------
public void actionPerformed (ActionEvent event)
{
if (count%20==0)
enemies.add(new BadGuy(WIDTH-10, HEIGHT-10));
for (BadGuy enemy: enemies)
{
enemy.move();
}
count++;
repaint();
}
}
private class BulletListener implements ActionListener
{
//--------------------------------------------------------------
// Updates the position of the image and possibly the direction
// of movement whenever the timer fires an action event.
//--------------------------------------------------------------
public void actionPerformed (ActionEvent event)
{
for(Bullet bullet: bullets)
bullet.move();
for(int i = 0; i < bullets.size(); i++)
{
if (enemies.size() != 0)
{
if (bullets.get(i).getX() > enemies.get(0).getX())
{
bullets.remove(i);
enemies.remove(0);
}
}
if (bullets.size() != 0)
{
if (bullets.get(i).getX()>WIDTH)
bullets.remove(i);
}
}
repaint();
}
}
}
import java.awt.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class GoodGuy
{
private int x, y, size;
private Bullet bullet;
public GoodGuy(int x, int y, int height)
{
size = height;
this.x = x;
this.y = y;
}
public int getSize()
{
return size;
}
public void draw(Graphics page)
{
page.drawRect(x, y, size, size);
}
public void shoot()
{
bullet = new Bullet(x+size, y);
}
}
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class BadGuy
{
private int x, y;
final int RADIUS = 5;
public BadGuy(int x, int y)
{
this.x = x;
this.y = y;
}
public void move()
{
x -= 5;
}
public void draw(Graphics page)
{
page.drawOval(x, y, RADIUS*2, RADIUS*2);
}
public int getX()
{
return x;
}
}
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.Timer;
public class Bullet
{
private int x, y;
final int LENGTH = 5, DELAY =200;
public Bullet(int x, int y)
{
this.x = x;
this.y = y;
}
public void draw(Graphics page)
{
page.drawLine (x, y, x+LENGTH, y);
}
public void move()
{
x += 5;
}
public int getX()
{
return x;
}
}
射手類仍然是一樣的。這就是我希望程序要做的事情，但這不完全是我希望它做到的。我更喜歡它是否更面向對象，並且每個類都照顧好自己。 ShooterPanel已經開始因爲我的口味而變得有點複雜，並且隨着更多的程序添加到遊戲中而變得更糟。我想改變的一件事是每個子彈都有自己的計時器，並在Bullet類中定義了一個ActionListener。但是，我無法弄清楚如何做到這一點，以便每當計時器觸發事件時重新繪製子彈。如果有人知道這樣做的方式，請讓我知道。
另請參閱示例[此處]（http://stackoverflow.com/q/9849950/230513）和[這裏]（http://stackoverflow.com/q/3066590/230513）。 – trashgod 2012-08-05 20:43:37