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                            ### 并行流
	就是把一個內容分成多個數據塊，并用不同的線程分別處理每個數據塊的流。
    java8提供了parallel()和sequential()在并行流與串行流進行交換。
	parallel()的底層是Fork/Join
```java
OptionalLong sum = LongStream.rangeClosed(0, 100000000l)
                .parallel()  //轉換為并行流	
                .reduce(Long::sum);
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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