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How can I turn a List of Lists into a List in Java 8?

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春和景丽
春和景丽 2020-11-22 04:49

If I have a List>, how can I turn that into a List that contains all the objects in the same iteration order
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  • 一个人的身影
    一个人的身影 (楼主)
    2020-11-22 05:14

    You can use flatMap to flatten the internal lists (after converting them to Streams) into a single Stream, and then collect the result into a list:

    List> list = ...
List flat = 
    list.stream()
        .flatMap(List::stream)
        .collect(Collectors.toList());

    
    
             
    
                                                        
    
            
            
    
              
                
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