2つのarraylistsでequalを使うことはできません

Question

だから私はこれらの2つを持っていますArrayListsボール用と敵用です。私はボールのxとyの指が、両方とも取り除かれるべき敵の指のxとyの指に等しいときに欲しい。ここでは、コードは次のようになります。

メイン：

import java.awt.Color; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.event.KeyEvent; 
import java.awt.event.KeyListener; 
import javax.swing.JFrame; 
import javax.swing.JPanel; 
import javax.swing.Timer; 

public class Main extends JPanel implements ActionListener, KeyListener{ 
Timer t = new Timer(5,this); 
public JFrame f; 
public Paint p; 
public Ball ball; 
public Enemy enemy; 
public static Main main; 
private boolean s1 = false, s2 = false, s3 = false; 

public Main(){ 
    f = new JFrame(); 
    f.setSize(500,500); 
    f.setBackground(new Color(32768)); 
    f.setVisible(true); 
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    f.add(p = new Paint()); 
    f.addKeyListener(this); 
    f.setResizable(false); 
    t.start(); 

} 
public void actionPerformed(ActionEvent arg0) { 
    p.color++; 
    p.c++; 
    p.move(); 
    p.repaint(); 
} 

public void keyPressed(KeyEvent arg0) { 
    if (arg0.getKeyCode() == KeyEvent.VK_A) 
    { 
     p.velx = -1; 
     s1 = true; 
    } 
    if (arg0.getKeyCode() == KeyEvent.VK_D) 
    { 
     p.velx = 1; 
     s2 = true; 
    } 
    if (arg0.getKeyCode() == KeyEvent.VK_SPACE){ 
     p.al.add(new Ball(p.x +30,p.y2)); 
     s3 = true; 
    } 
    if(s1==true && s3==true) 
    { 
     p.velx = -1; 
     p.al.add(new Ball(p.x +30,p.y2)); 
    } 
    if(s2==true && s3==true) 
    { 
     p.velx = 1; 
     p.al.add(new Ball(p.x +30,p.y2)); 
    } 
    if (s3 == true){ 
     p.al.add(new Ball(p.x +30,p.y2)); 
    } 
} 

public void keyReleased(KeyEvent arg0) { 
     if (arg0.getKeyCode() == KeyEvent.VK_A) 
     { 
      p.velx = 0; 
      s1 = false; 
     } 
     if (arg0.getKeyCode() == KeyEvent.VK_D) 
     { 
      p.velx = 0; 
      s2 = false; 
     } 
     if (arg0.getKeyCode() == KeyEvent.VK_SPACE){ 
      s3 = false; 
     } 
} 

public void keyTyped(KeyEvent arg0) { 

} 

public static void main(String[] args){ 
    main = new Main(); 
} 
} 

ペイント：

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.util.ArrayList; 
import java.util.Iterator; 
import java.util.Random; 

import javax.swing.JPanel; 
import javax.swing.Timer; 
public class Paint extends JPanel implements ActionListener{ 
Timer t = new Timer(5,this); 
public int x = 250, y = 450, velx = 0, color = 1,vely = -1,y2 = y, c = 32768, velz = 1; 
public ArrayList<Ball> al = new ArrayList<Ball>(); 
public ArrayList<Enemy> al2 = new ArrayList<Enemy>(); 
Random rx = new Random(); 
Random ry = new Random(); 
public Enemy enemy; 
public Ball ball; 

public Paint(){ 
    createEnemys(); 
} 

ActionListener taskPerformer = new ActionListener(){ 
    public void actionPerformed(ActionEvent arg0) { 
     Iterator<Enemy> it = al2.iterator(); 
     while (it.hasNext()) { 
      Enemy enemy = it.next(); 
      if (enemy.x == 520) 
      { 
       enemy.x = -120; 
      } 
      enemy.x +=1; 
      repaint(); 
     } 
    } 
}; 
Timer t2 = new Timer(5,taskPerformer); 

public void actionPerformed(ActionEvent arg0) { 
    Iterator<Ball> it = al.iterator(); 
    while (it.hasNext()) { 
     Ball ball = it.next(); 
     if (ball.y < -10) { 
      it.remove(); 
      System.out.println(enemy.getX()); 
     } else { 
      ball.y += vely; 
      repaint(); 
     } 
    } 
} 

public void paintComponent(Graphics g){ 
    super.paintComponent(g); 
    g.setColor(Color.gray); 
    g.fillRect(0, 0, 500, 500); 
    for(Ball ball : this.al) { 
     g.setColor(Color.RED); 
     g.fillOval(ball.x,ball.y,10,10); 
     t.start(); 
    } 
    for(Enemy enemy : this.al2) { 
     g.setColor(new Color(c)); 
     g.fillRect(enemy.x,enemy.y,enemy.h,enemy.w); 
     t2.start(); 
    } 
    g.setColor(new Color(color)); 
    g.fillRect(x, y, 70, 10); 
} 



public void move(){ 
    x += velx; 
    if (x <= 3) 
    { 
     x = 3; 
    } 
    if (x >= 420) 
    { 
     x = 420; 
    } 
} 

public void createEnemys(){ 
    al2.add(new Enemy(-60,10,60,10)); 
    al2.add(new Enemy(20,10,60,10)); 
    al2.add(new Enemy(100,10,60,10)); 
    al2.add(new Enemy(180,10,60,10)); 
    al2.add(new Enemy(260,10,60,10)); 
    al2.add(new Enemy(340,10,60,10)); 
    al2.add(new Enemy(420,10,60,10)); 
    al2.add(new Enemy(500,10,60,10)); 

    al2.add(new Enemy(-60,30,60,10)); 
    al2.add(new Enemy(20,30,60,10)); 
    al2.add(new Enemy(100,30,60,10)); 
    al2.add(new Enemy(180,30,60,10)); 
    al2.add(new Enemy(260,30,60,10)); 
    al2.add(new Enemy(340,30,60,10)); 
    al2.add(new Enemy(420,30,60,10)); 
    al2.add(new Enemy(500,30,60,10)); 

    al2.add(new Enemy(-60,50,60,10)); 
    al2.add(new Enemy(20,50,60,10)); 
    al2.add(new Enemy(100,50,60,10)); 
    al2.add(new Enemy(180,50,60,10)); 
    al2.add(new Enemy(260,50,60,10)); 
    al2.add(new Enemy(340,50,60,10)); 
    al2.add(new Enemy(420,50,60,10)); 
    al2.add(new Enemy(500,50,60,10)); 

    al2.add(new Enemy(-60,70,60,10)); 
    al2.add(new Enemy(20,70,60,10)); 
    al2.add(new Enemy(100,70,60,10)); 
    al2.add(new Enemy(180,70,60,10)); 
    al2.add(new Enemy(260,70,60,10)); 
    al2.add(new Enemy(340,70,60,10)); 
    al2.add(new Enemy(420,70,60,10)); 
    al2.add(new Enemy(500,70,60,10)); 
} 

} 

ボール：

import javax.swing.JPanel; 

public class Ball extends JPanel{ 
public int x,y; 
public Ball(int x1, int y1) { 
    x = x1; 
    y = y1; 
} 
} 

そして最後に敵：

import javax.swing.JPanel; 

public class Enemy extends JPanel{ 
public int x,y,h,w; 
public Enemy(int x, int y,int h,int w) { 
    this.x = x; 
    this.y = y; 
    this.h = h; 
    this.w = w; 
} 
public int getX() { 
    return x; 
} 
public int getY() { 
    return y; 
} 
} 

問題はClass Paintです。ボールと敵の衝突を確認できないため、ボールを取り除くことができません。誰でもおかげで

Answer 1

あなたがJava 8を使用すると仮定すると、私を助けることができるならば、それはこれに一致するすべての要素を削除するStream API及び方法removeAll(Collection)を使用して行うことができます。

al.removeAll(
    al.stream().filter(
     ball -> { 
      List<Enemy> enemies = al2.stream() 
       .filter(enemy -> ball.x == enemy.x && ball.y == enemy.y) 
       .collect(Collectors.toList()); 
      al2.removeAll(enemies); 
      return !enemies.isEmpty(); 
     } 
    ).collect(Collectors.toList()) 
); 

そうしないと、あなたはまだ古いを使用することができますIteratorを反復2 loopsとのアプローチは、方法remove()

main: for (Iterator<Ball> itBall = al.iterator(); itBall.hasNext();) { 
    Ball ball = itBall.next(); 
    for (Iterator<Enemy> itEnemy = al2.iterator(); itEnemy.hasNext();) { 
     Enemy enemy = itEnemy.next(); 
     if (ball.x == enemy.x && ball.y == enemy.y) { 
      itBall.remove(); 
      itEnemy.remove(); 
      continue main; 
     } 
    } 
}