Question

How to check if a set is a subset of another set in Java

Answer 1

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

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

        Set<Integer> set1 = new HashSet<>();
        set1.add(1);
        set1.add(2);
        set1.add(3);
        set1.add(4);
        set1.add(5);
        System.out.println("set1: " + set1);

        Set<Integer> set2 = new HashSet<>();
        set2.add(2);
        set2.add(4);
        System.out.println("set2: " + set2);
        
        boolean b = set1.containsAll(set2);
        System.out.println(b);
    }
}
  
  
  
  
/*
run:
    
set1: [1, 2, 3, 4, 5]
set2: [2, 4]
true

*/

 

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