How to Compare Two LinkedHashSet in Java

In this example we will show how to obtain common elements of two LinkedHashSet.

Source Code

package com.beginner.examples;

import java.util.LinkedHashSet;

public class RetainAllExample {
 
    public static void main(String a[]){
         
        LinkedHashSet set1 = new LinkedHashSet();
        //add elements 
        set1.add("1");
        set1.add("2");
        set1.add("3");
        System.out.println("set1 : " + set1);
        LinkedHashSet set2 = new LinkedHashSet();
        //add elements
        set2.add("4");
        set2.add("5");
        set2.add("2");
        System.out.println("set2 : " + set2);
        // get common elements
        set1.retainAll(set2);
        System.out.println("Common elements : " + set1);
    }
}

Output:

set1 : [1, 2, 3]
set2 : [4, 5, 2]
Common elements : [2]

References

Imported packages in Java documentation:

LinkedHashSet