Question

How to use HashSet with characters in Java

Answer 1

import java.util.HashSet;

public class MyClass {
    public static void main(String args[]) {
        HashSet<Character> hs =new HashSet<Character>();
        
        hs.add('j');
        hs.add('a');
        hs.add('v');
        hs.add('a');
        
        System.out.println(hs);
    }
}

/*
run:

[a, v, j]

*/

 

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Answer 2

import java.util.*;

public class MyClass {
    public static void main(String args[]) {
        HashSet<Character> hs =new HashSet<Character>();
        
        hs.add('j');
        hs.add('a');
        hs.add('v');
        hs.add('a');
        
        Iterator it = hs.iterator();
        while(it.hasNext()) {
            System.out.println(it.next());
        }
    }
}


/*
run:

a
v
j

*/

 

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