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Add object to ArrayList at specified index

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南笙 2020-11-30 18:59

I think it\'s a fairly simple question, but I can\'t figure out how to do this properly.

I\'ve got an empty arraylist:

ArrayList list =         


        
      
      
      

        

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                 自闭症患者 
              
              
    
                
                   自闭症患者
                                             
                
                
                (楼主)
            
              
                  
    
                2020-11-30 19:51
              
    

            
    
            
    
              
              

    How about this little while loop as a solution?
    


    private ArrayList list = new ArrayList();

private void addObject(int i, Object object) {
    while(list.size() < i) {
        list.add(list.size(), null);
    }
    list.add(i, object);
}
....

addObject(1, object1)
addObject(3, object3)
addObject(2, object2)

    
    
             
    
                                                        
    
            
            
    
              
                
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