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                            ### Callable

```
public interface Callable<V> {
    V call() throws Exception;
}
```

Callable是類似于Runnable的接口，實現Callable接口的類和實現Runnable的類都是可被其它線程執行的任務；

Runnable和Callable描述的都是抽象的計算任務，Callable和Runnable有幾點不同：
1. Callable規定的方法是call\(\)，而Runnable規定的方法是run\(\)；
2. Callable的任務執行后可返回值，而Runnable的任務是不能返回值的；
3. call\(\)方法可拋出異常，而run\(\)方法是不能拋出異常的；
4. 運行Callable任務可拿到一個Future對象；


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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