变量不在线程中更新

Question

我最近在线教程下载了一些简单的游戏代码。我目前正试图让它成为多人游戏。然而，在我的坐标写入套接字的程序部分，变量不会更新。我在互联网上搜索了所有的答案，但我找不到答案。我已经测试了代码并且Ints得到了成功发送。

我Client.java

import java.net.*; 
import java.util.Scanner; 
import java.io.*; 

import javax.swing.SwingUtilities; 



public class Client implements Runnable{ 

    public void run() { 

     Craft crObj = new Craft(); 
     int playerX = 3001; 
    int playerY = 300; 
     String serverName = "127.0.0.1"; 
     int port = 6789; 
     int port1 = 6788; 
     Socket client = null, client1 = null; 
     System.out.println("Connecting to " + serverName + " on port " + port); 
     OutputStream outsetup = null, out1setup = null; 


     try { 
     client = new Socket(serverName, port); 
     client1 = new Socket(serverName, port1); 
     } catch (IOException e) { 
      System.out.println(e); 
     } 
     System.out.println("Connected"); 

     Scanner test = new Scanner(System.in); 
     try { 
      outsetup = client.getOutputStream(); 
      out1setup = client1.getOutputStream(); 
     } catch(IOException e) { 
      System.out.println(e); 
     } 
     DataOutputStream out = new DataOutputStream(outsetup); 
     DataOutputStream out1 = new DataOutputStream(out1setup); 


     while(true) { 
      try { 
//Doesn't Update Here 
       playerX = crObj.getX(); 
       playerY = crObj.getY(); 
       out.writeInt(playerX); 
       out.flush(); 
       out1.writeInt(playerY); 
       out1.flush(); 

      } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
      } 

     } 

    } 
} 

我Craft.java

import java.awt.Image; 
import java.awt.event.KeyEvent; 

import javax.swing.ImageIcon; 

public class Craft { 

    private String craft = "craft.png"; 
    Client clObj = new Client(); 
    public int dx; 
    public int dy; 
    public int x; 
    public int y; 
    private Image image; 
    public ImageIcon ii; 

    public Craft() { 
     ImageIcon ii = new ImageIcon(this.getClass().getResource(craft)); 
     image = ii.getImage(); 
     x = 40; 
     y = 60; 
    } 


    public void move() { 
     x += dx; 
     y += dy; 
    } 

    public int getX() { 
     return x; 
    } 

    public int getY() { 
     return y; 
    } 

    public Image getImage() { 
     return image; 
    } 
    public void keyPressed(KeyEvent e) { 

     int key = e.getKeyCode(); 

     if (key == KeyEvent.VK_LEFT) { 
      dx = -2; 
      ii = new ImageIcon(this.getClass().getResource("craftBACK.png")); 
      image = ii.getImage(); 
     } 

     if (key == KeyEvent.VK_RIGHT) { 
      dx = 2; 
      ii = new ImageIcon(this.getClass().getResource("craft.png")); 
      image = ii.getImage(); 
     } 

     if (key == KeyEvent.VK_UP) { 
      dy = -2; 
      ii = new ImageIcon(this.getClass().getResource("craftUP.png")); 
      image = ii.getImage(); 
     } 

     if (key == KeyEvent.VK_DOWN) { 
      dy = 2; 
      ii = new ImageIcon(this.getClass().getResource("craftDOWN.png")); 
      image = ii.getImage(); 
     } 
    } 

    public void keyReleased(KeyEvent e) { 
     int key = e.getKeyCode(); 

     if (key == KeyEvent.VK_LEFT) { 
      dx = 0; 
     } 

     if (key == KeyEvent.VK_RIGHT) { 
      dx = 0; 
     } 

     if (key == KeyEvent.VK_UP) { 
      dy = 0; 
     } 

     if (key == KeyEvent.VK_DOWN) { 
      dy = 0; 
     } 

    } 
} 

Board.java

import java.awt.Color; 
import java.awt.Graphics; 
import java.awt.Graphics2D; 
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 javax.swing.JPanel; 
import javax.swing.Timer; 


public class Board extends JPanel implements ActionListener { 
    public int xMain = 0; 
    Client clObj = new Client(); 
    private Timer timer; 
    private Craft craft; 

    public Board() { 

     addKeyListener(new TAdapter()); 
     setFocusable(true); 
     setBackground(Color.BLACK); 
     setDoubleBuffered(true); 

     craft = new Craft(); 

     timer = new Timer(5, this); 
     timer.start(); 
    } 


    public void paint(Graphics g) { 
     super.paint(g); 

     Graphics2D g2d = (Graphics2D)g; 
     g2d.drawImage(craft.getImage(), craft.getX(), craft.getY(), this); 

     Toolkit.getDefaultToolkit().sync(); 
     g.dispose(); 
    } 


    public void actionPerformed(ActionEvent e) { 
     craft.move(); 
     xMain = craft.getX(); 
     System.out.println(xMain); 
     repaint(); 
    } 


    private class TAdapter extends KeyAdapter { 

     public void keyReleased(KeyEvent e) { 
      craft.keyReleased(e); 
     } 

     public void keyPressed(KeyEvent e) { 
      craft.keyPressed(e); 
     } 
    } 

} 

RType.java

import javax.swing.JFrame; 

public class RType extends JFrame { 

    public RType() { 

     add(new Board()); 

     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     setSize(400, 300); 
     setLocationRelativeTo(null); 
     setTitle("R - Type"); 
     setResizable(false); 
     setVisible(true); 
     (new Thread(new Client())).start(); 
    } 

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

Answer 1

由于您正在访问来自不同线程的值，因此它们不稳定应该有所帮助。

更换

public int dx; 
public int dy; 
public int x; 
public int y; 

与

public volatile int dx; 
public volatile int dy; 
public volatile int x; 
public volatile int y; 

您可能还需要设置你的，而有一些延迟（true）循环

playerX = crObj.getX(); 
playerY = crObj.getY(); 

获取这些值的一些延迟后（线程.sleep（100））