发表新帖
发表新帖

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

后端 未结
关注
9 783
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
9条回答
  • 南方客
    南方客 (楼主)
    2020-11-22 05:12

    flatmap is better but there are other ways to achieve the same

    List> listOfList = ... // fill

List collect = 
      listOfList.stream()
                .collect(ArrayList::new, List::addAll, List::addAll);

    
    
             
    
                                                        
    
            
            
    
              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              
    
                          
             
       
          
              
    
                                       
    

    

                
    
                         
          
                              			
        
        
        
    
          
    
            
            
    
              
              
    
            
    


                                 
              
    
            
    
                          
    

        
         
    
                
                
    
                  
                
    
                
    
                   看不清?
                
    
              
    
                                  
    
                    
   
                 
             
              
    提交回复
    
            
    
          
    
        
    
      
       
      
    
    
    
          
 
     
 
    
        
    热议问题