Java BitSet equals() method

The equals() method of Java BitSet class is used to compare the current BitSet object with specified object. The result of comparing BitSet bit with BitSet object returns true if and only if the specified object is not null and the set of BitSet object must have exactly same set of bit set to true as this BitSet.

For every non-negative int index i, the followinh condition:

Syntax:

Parameter:

DataType	Parameter	Description
Object	obj	It is an object which is to be compared with this BitSet sets.

Returns:

This method returns true if the objects are the same as current bit set otherwise, returns false.

Exception:

Compatibility Version:

Java 1.0 and above

Example 1

import java.util.BitSet;

public class BitSetEqualsExample1 {
	public static void main(String[] args) {
		// creating bitset
	      BitSet bitset = new BitSet(5);
	      
	      Object obj = new BitSet(5);

	      bitset.set(0);
	      bitset.set(1);
	      bitset.set(2);
	      bitset.set(3);
	      bitset.set(4);

	      ((BitSet) obj).set(0);
	      ((BitSet) obj).set(1);
	      ((BitSet) obj).set(2);
	      ((BitSet) obj).set(3);
	      ((BitSet) obj).set(4);

	      // print current bitsets
	      System.out.println("bitset:" + bitset);
	      System.out.println("object:" + obj);
	      boolean bol = bitset.equals(obj);
	      if(bol==true) {
	    	  System.out.println("BitSet is equal to specified Object");
	      }
	      else {
	    	  System.out.println("BitSet is not equal to specified Object");
	      }
	}
}

Output:

bitset:{0, 1, 2, 3, 4}
object:{0, 1, 2, 3, 4}
BitSet is equal to specified Object

Example 2

The equals() method return false, if the length of sets of BitSet are not equal to the length of BitSet object or even all the index of BitSet are not equals to the index of BitSet object.

import java.util.BitSet;

public class BitSetEqualsExample2 {
	public static void main(String[] args) {
		// creating bitset
	      BitSet bitset1 = new BitSet(5);
	      BitSet bitset2 = new BitSet(5);
	      
	      Object obj = new BitSet(5);

	      bitset1.set(0);
	      bitset1.set(1);
	      bitset1.set(2);
	      bitset1.set(3);
	      bitset1.set(4);
	      bitset1.set(5);
	      
	      bitset2.set(0);
	      bitset2.set(1);
	      bitset2.set(2);
	      bitset2.set(3);
	      bitset2.set(5);
	      
	      ((BitSet) obj).set(0);
	      ((BitSet) obj).set(1);
	      ((BitSet) obj).set(3);
	      ((BitSet) obj).set(2);
	      ((BitSet) obj).set(4);
	      
	      // print current bitsets
	      System.out.println("bitset1:" + bitset1);
	      System.out.println("bitset2:" + bitset2);
	      System.out.println("object:" + obj);
	      // comparing bitset1 with object
	      boolean bol = bitset1.equals(obj);
	      if(bol==true) {
	    	  System.out.println("BitSet1 is equal to specified Object");
	      }
	      else {
	    	  System.out.println("BitSet1 is not equal to specified Object");
	      }
	      
	      // comparing bitset2 with object
	      bol = bitset2.equals(obj);
	      if(bol==true) {
	    	  System.out.println("BitSet2 is equal to specified Object");
	      }
	      else {
	    	  System.out.println("BitSet2 is not equal to specified Object");
	      }
	}
}

Output:

bitset1:{0, 1, 2, 3, 4, 5}
bitset2:{0, 1, 2, 3, 5}
object:{0, 1, 2, 3, 4}
BitSet1 is not equal to specified Object
BitSet2 is not equal to specified Object

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