w3resource

Java: Compare two sets and retain elements which are same on both sets


11. Retain Common Elements in Sets

Write a Java program to compare two sets and retain elements that are the same.

Sample Solution:

Java Code:

import java.util.*;
  public class Exercise11 {
  public static void main(String[] args) {
     // Create a empty hash set
        HashSet<String> h_set1 = new HashSet<String>();
     // use add() method to add values in the hash set
          h_set1.add("Red");
          h_set1.add("Green");
          h_set1.add("Black");
          h_set1.add("White");
          System.out.println("Frist HashSet content: "+h_set1);
          HashSet<String>h_set2 = new HashSet<String>();
          h_set2.add("Red");
          h_set2.add("Pink");
          h_set2.add("Black");
          h_set2.add("Orange");
          System.out.println("Second HashSet content: "+h_set2);
          h_set1.retainAll(h_set2);
          System.out.println("HashSet content:");
          System.out.println(h_set1);
     }
}

Sample Output:

Frist HashSet content: [Red, White, Black, Green]                      
Second HashSet content: [Red, Pink, Black, Orange]                     
HashSet content:                                                       
[Red, Black]

Pictorial Presentation:

Java Collection, ArrayList Exercises: Compare two sets and retain elements which are same on both sets

Flowchart:

Flowchart: Compare two sets and retain elements which are same on both sets.

For more Practice: Solve these Related Problems:

  • Write a Java program to compute the intersection of two sets using the retainAll() method.
  • Write a Java program to use Java streams to find common elements between two sets and collect them into a new set.
  • Write a Java program to compare two sets and then remove all elements from one that are not present in the other.
  • Write a Java program to implement a custom method that returns the intersection of two sets without using built-in collection methods.

Go to:


PREV : Compare Two HashSets.
NEXT : Remove All from HashSet.

Java Code Editor:

Contribute your code and comments through Disqus.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Follow us on Facebook and Twitter for latest update.