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How to find duplicates in an ArrayList<Object>?

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轮回少年
轮回少年 2020-12-25 08:54

This is a pretty common question, but I could not find this part:

Say I have this array list:

List arrayList = new List
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  • 南笙
    南笙 (楼主)
    2020-12-25 09:14 

    public Set findDuplicates(List list) {
        Set items = new HashSet();
        Set duplicates = new HashSet();
        for (Object item : list) {
            if (items.contains(item)) {
                duplicates.add(item);
                } else { 
                    items.add(item);
                    } 
            } 
        return duplicates;
        }

    
    
             
    
                                                        
    
            
            
    
              
                
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