Algorithm

  1. Initialize two sets:

    • Set A
    • Set B

  2. Insert elements into sets:

    • Populate Set A and Set B with their respective elements.

  3. Create a new set for the union:

    • Create an empty set C to store the union of A and B.

  4. Iterate through Set A:

    • For each element in Set A, add it to Set C.

  5. Iterate through Set B:

    • For each element in Set B, add it to Set C.

  6. Result:

    • Set C now contains the union of Set A and Set B.

 

Code Examples

#1 Code Example- Calculate the union of two sets using addAll()

Code - Java Programming

import java.util.HashSet;
import java.util.Set;

class Main {
  public static void main(String[] args) {

    // create the first set
    Set < Integer> evenNumbers = new HashSet<>();
    evenNumbers.add(2);
    evenNumbers.add(4);
    System.out.println("Set1: " + evenNumbers);

    // create second set
    Set < Integer> numbers = new HashSet<>();
    numbers.add(1);
    numbers.add(3);
    System.out.println("Set2: " + numbers);

    // Union of two sets
    numbers.addAll(evenNumbers);
    System.out.println("Union is: " + numbers);
  }
}
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Output

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Set1: [2, 4]
Set2: [1, 3]
Union is: [1, 2, 3, 4]

#2 Code Example- Get union of two sets using Guava Library

Code - Java Programming

import java.util.HashSet;
import java.util.Set;
import com.google.common.collect.Sets;

class Main {
  public static void main(String[] args) {

    // create the first set
    Set < String> languages1 = new HashSet<>();
    languages1.add("Java");
    languages1.add("Python");
    System.out.println("Programming Languages: " + languages1);

    // create second set
    Set < String> languages2 = new HashSet<>();
    languages2.add("English");
    languages2.add("Spanish");
    System.out.println("Human Language: " + languages2);

    Set < String> unionSet = Sets.union(languages1, languages2);
    System.out.println("Union is: " + unionSet);
  }
}
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Output

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Programming Languages: [Java, Python]
Human Languages: [English, Spanish]
Languages: [Java, Python, English, Spanish]
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Demonstration

Java Programing Example to Calculate union of two sets-DevsEnv