Java如何通過一個線程的額外對象

Question

我不認爲這是可能的，但我想告訴我的每個線程工作在一個特定的對象。有點兒像這樣 -

class Tester implements Runnable{ 
    String s1, s2; 
    Thread t1, t2; 

    test(){ 
     t1 = new Thread(this, "t1"); 
     t2 = new Thread(this, "t2"); 
     t1.start(); 
     t2.start(); 
    } 

    public void run(){ 
     if(this is t1){ 
      s1="s1"; 
     } 
     if(this is t2){ 
      s2="s2"; 
     } 
    } 
} 

我想以某種方式能夠告訴thread t1對s2上string s1和t2運行代碼。現在我只是通過檢查Thread.currentThreat.getName()來做到這一點，但那不是一個好方法。另一種方法是製作一個匿名的Runnable類，它有自己的字符串，並且只有run就可以了，但是接下來主線程如何得到兩個字符串呢？

Answer 1

爲什麼不通過Thread的不同Runnable s？

Runnable r1 = new Runnable() { public void run() { /* this is r1 */ } }; 
Runnable r2 = new Runnable() { public void run() { /* this is r2 */ } }; 
Thread t1 = new Thread(r1); 
Thread t2 = new Thread(r2); 
t1.start(); 
t2.start(); 

/編輯

創建一個類可以實例：

public class MyRunnable implements Runnable { 
    private final String s; 

    public MyRunnable(Stirng s) { 
     this.s = s; 
    } 

    public void run() { 
     // do something with s 
    } 
} 

Thread t1 = new Thread(new MyRunnable("s1")); 
Thread t2 = new Thread(new MyRunnable("s2")); 
t1.start(); 
t2.start(); 

/E2

import java.util.concurrent.Callable; 
import java.util.concurrent.ExecutionException; 
import java.util.concurrent.ExecutorService; 
import java.util.concurrent.Executors; 
import java.util.concurrent.Future; 

public class ExecutorServiceExample { 
    private static class CallableExample implements Callable<Integer> { 
     private final Object foo; 

     private CallableExample(Object foo) { 
      this.foo = foo; 
     } 

     @Override 
     public Integer call() { 
      // do something and return it 
      return foo.hashCode(); 
     } 

    } 

    public static void main(String[] args) throws InterruptedException, ExecutionException { 
     ExecutorService e = Executors.newFixedThreadPool(2); 
     Future<Integer> f1 = e.submit(new CallableExample("foo")); 
     Future<Integer> f2 = e.submit(new CallableExample("bar")); 

     System.out.println(f1.get()); 
     System.out.println(f2.get()); 

     e.shutdown(); 
    } 
} 

Here的對Executor框架一個很好的教程。

Answer 2

我會建議使用Thread Local

你可以從here訪問虛擬實例和here