How to check if Two Sets are Equal in Java - Step by Step Examples

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How to check if Two Sets are Equal in Java ?

Answer

To check if two sets are equal in Java, you can use the equals() method.

✐ Examples

1 Check Equality of Two Sets using equals() Method - Equal Sets

In this example,

We create two sets named set1 and set2.
We add the same elements to both sets.
We call the equals() method on set1 and pass set2 as an argument.
The equals() method returns true if both sets contain the same elements, in the same order, and false otherwise.

Java Program

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

public class Main {
    public static void main(String[] args) {
        Set<Integer> set1 = new HashSet<>();
        Set<Integer> set2 = new HashSet<>();
        set1.add(1); set1.add(2); set1.add(3);
        set2.add(1); set2.add(2); set2.add(3);
        System.out.println(set1.equals(set2));
    }
}

Output

true

2 Check Equality of Two Sets using equals() Method - Non-Equal Sets

In this example,

We create two sets named set1 and set2.
We add different elements to both sets.
We call the equals() method on set1 and pass set2 as an argument.
The equals() method returns false since both sets contain different elements.

Java Program

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

public class Main {
    public static void main(String[] args) {
        Set<Integer> set1 = new HashSet<>();
        Set<Integer> set2 = new HashSet<>();
        set1.add(1); set1.add(2); set1.add(3);
        set2.add(4); set2.add(5); set2.add(6);
        System.out.println(set1.equals(set2));
    }
}

Output

false

Summary

In this tutorial, we learned How to check if Two Sets are Equal in Java language with well detailed examples.

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How to check if Two Sets are Equal in Java - Step by Step Examples

How to check if Two Sets are Equal in Java ?

Answer

✐ Examples

1 Check Equality of Two Sets using equals() Method - Equal Sets

Java Program

Output

2 Check Equality of Two Sets using equals() Method - Non-Equal Sets

Java Program

Output

Summary

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