Question

How to find duplicate words in string in Java

Answer 1

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Collections;
import java.util.Arrays;
 
public class MyClass {
    public static void main(String args[]) {
        String s = "java php php php java c# python c++ c++";
  
         List<String> list = Arrays.asList(s.split(" "));
 
        Set<String> uniqueWords = new HashSet<String>(list);
        for (String word : uniqueWords) {
            if (Collections.frequency(list, word) > 1)
                System.out.println(word);
        }
    }
}
  
 
 
  
/*
run:
 
c++
java
php
 
*/

 

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