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

Java Collection, HashSet Exercises: Exercise-11 with Solution

Write a Java program to compare two sets and retain elements which are same on both sets.

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.

Java Code Editor:

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Java: Tips of the Day

getEnumMap

Converts to enum to Map where key is the name and value is Enum itself.

public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) {
    return Arrays.stream(enumClass.getEnumConstants())
            .collect(Collectors.toMap(Enum::name, Function.identity()));
}

Ref: https://bit.ly/3xXcFZt