发表新帖
发表新帖

sort a list of different type of objects

后端 未结
关注
4 1021
小鲜肉
小鲜肉 2021-01-14 01:57

I have a list of objects which contains different types of objects but a single property is common among all. list contains objects of Field class, Button Class, Page class

4条回答
  • 滥情空心
    滥情空心 (楼主)
    2021-01-14 02:12

    If there are a few classes you want to sort (Field,Button,Page...) you could do a Class that inherits from Comparator and use the java.lang.Object.getClass() and casting in an switch clasusule.

    Something like:

    public class MyComparator implements Comparator{
        @Override
        public int compare(Object o1, Object o2) {
            int o1prop,o2prop;
            switch (o1.getClass().toString()) {
            case "java.Button":
                ((Button)o1prop).getSequence_no();
                break;

            default:
                break;
            }

            switch (o2.getClass().toString()) {
            case "java.Field":
                ((Field)o1prop).getSequence_no();
                break;

            default:
                break;
            }

            return o1prop-o2prop;
        }



    And after that use:
    


    Collections.sort(list, new MyComparator());

    
    
    
             
    
                                                        
    
            
            
    
              
                
                0
              
                   
                
               讨论(0)
              
                                                  
              
              
    
                          
             
       
          
              
    
                                       
    

    

                
    
                         
          
                              			
        
        
        
    
          
    
            
            
    
              
              
    
            
    


                                 
              
    
            
    
                          
    

        
         
    
                
                
    
                  
                
    
                
    
                   看不清?
                
    
              
    
                                  
    
                    
   
                 
             
              
    提交回复
    
            
    
          
    
        
    
      
       
      
    
    
    
          
 
     
 
    
        
    热议问题