Question

How to find duplicate words and letters in a string with 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 x y x y y y c# python q w";
 
        List<String> list = Arrays.asList(s.split(" "));
        System.out.println(list);
 
        Set<String> set_without_duplicates = new HashSet<String>(list);
        System.out.println(set_without_duplicates);
        
        for (String word : set_without_duplicates) {
            if (Collections.frequency(list, word) > 1)
                System.out.println(word + ": " + Collections.frequency(list, word));
        }
    }
}
 


 
/*
run:

[java, php, php, php, java, x, y, x, y, y, y, c#, python, q, w]
[c#, python, q, java, w, x, php, y]
java: 2
x: 2
php: 3
y: 4

*/

 

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