BitSet equals() Method in Java with Examples

Last Updated : 27 Dec, 2018

The equals() method of Java BitSet class is used to check for equality between two bitsets. It verifies whether the elements of one set passed as a parameter is equal to the elements of this set or not. The method returns true if the bitsets match else false. Syntax:

Bit_Set1.equals(Bit_Set2)

Parameters: The method accepts one parameter Bit_Set2 of bitset type and refers to the set whose equality is to be checked with this bit set. Return Value: The method returns true if the equality holds for both the object set else it returns false. Below programs illustrate the working of BitSet equals() method in Java. Program 1:

Java

// Java code to illustrate equals() import java.util.*;  public class BitSet_Demo {     public static void main(String args[])     {         // Creating an empty BitSet         BitSet bit_set1 = new BitSet();         BitSet bit_set2 = new BitSet();          // Use set() method to add elements into the Set         bit_set1.set(40);         bit_set1.set(25);         bit_set1.set(80);         bit_set1.set(95);         bit_set1.set(5);          // Use set() method to add elements into the Set         bit_set2.set(25);         bit_set2.set(40);         bit_set2.set(5);         bit_set2.set(95);         bit_set2.set(80);          // Displaying the BitSets         System.out.println("First BitSet: " + bit_set1);         System.out.println("Second BitSet: " + bit_set2);          // Checking for equality         System.out.println("Are the sets equal? "                            + bit_set1.equals(bit_set2));     } }

Output:

  First BitSet: {5, 25, 40, 80, 95}  Second BitSet: {5, 25, 40, 80, 95}  Are the sets equal? true

Program 2:

Java

// Java code to illustrate equals() import java.util.*;  public class BitSet_Demo {     public static void main(String args[])     {         // Creating an empty BitSet         BitSet bit_set1 = new BitSet();         BitSet bit_set2 = new BitSet();          // Use set() method to add elements into the Set         bit_set1.set(40);         bit_set1.set(25);         bit_set1.set(80);         bit_set1.set(95);         bit_set1.set(5);          // Use set() method to add elements into the Set         bit_set2.set(10);         bit_set2.set(20);         bit_set2.set(30);         bit_set2.set(40);         bit_set2.set(50);          // Displaying the BitSets         System.out.println("First BitSet: " + bit_set1);         System.out.println("Second BitSet: " + bit_set2);          // Checking for equality         System.out.println("Are the sets equal? "                            + bit_set1.equals(bit_set2));     } }

Output:

  First BitSet: {5, 25, 40, 80, 95}  Second BitSet: {10, 20, 30, 40, 50}  Are the sets equal? false

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