import java.util.concurrent.*; 

/** 
* Java執行緒：有返回值的執行緒 
* 
* @author Administrator 2009-11-5 0:41:50 
*/ 
public class Test { 
        public static void main(String[] args) throws ExecutionException, InterruptedException { 
                //建立一個執行緒池 
                ExecutorService pool = Executors.newFixedThreadPool(2); 
                //建立兩個有返回值的任務 
                Callable c1 = new MyCallable("A"); 
                Callable c2 = new MyCallable("B"); 
                //執行任務並獲取Future物件 
                Future f1 = pool.submit(c1); 
                Future f2 = pool.submit(c2); 
                //從Future物件上獲取任務的返回值，並輸出到控制檯 
                System.out.println(">>>"+f1.get().toString()); 
                System.out.println(">>>"+f2.get().toString()); 
                //關閉執行緒池 
                pool.shutdown(); 
        } 
} 

class MyCallable implements Callable{ 
        private String oid; 

        MyCallable(String oid) { 
                this.oid = oid; 
        } 

        @Override 
        public Object call() throws Exception { 
                return oid+"任務返回的內容"; 
        } 
}