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Remove duplicates from ArrayLists

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孤街浪徒
孤街浪徒 2020-11-27 04:12

I have an ArrayList of custom objects. I want to remove duplicate entries.

The objects have three fields: title, subtitle, and id. If a su

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  • 心在旅途
    心在旅途 (楼主)
    2020-11-27 04:47

    You can put the content of the ArrayList in a TreeSet using a custom Comparator which should return 0 if the two subtitles are the same. After that you can convert the Set in a List and have the List without "duplicates". Here is an example for Object, of course you should use the correct class and logic.

    public void removeDuplicates(List l) {
    // ... the list is already populated
    Set s = new TreeSet(new Comparator() {

        @Override
        public int compare(Object o1, Object o2) {
            // ... compare the two object according to your requirements
            return 0;
        }
    });
            s.addAll(l);
    List res = Arrays.asList(s.toArray());
}

    
    
             
    
                                                        
    
            
            
    
              
                
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