Java Long class

Java BitSet size() method

Last Updated : 17 Mar 2025

The size() method of Java BitSet class returns the total number of bit space actually in use by this BitSet to represent bit values. The maximum element in the set is the size - 1st element.

The default size of the bit set is 64-bit space. If the bit is set at index larger than the current BitSet size, it increases its bit space in the multiplication of 64*n, where n starts from 1, 2, 3, so on.

Syntax:

Parameter:

Returns:

This method returns the number of bits space currently in this bit set.

Exception:

Compatibility Version:

Java 1.0 and above

Example 1

import java.util.BitSet;

public class BitSetSizeExample1 {
	public static void main(String[] args) {

	      BitSet bitset1 = new BitSet(5);
	      BitSet bitset2 = new BitSet(5);

	      bitset1.set(1);
	      bitset1.set(2);
	      bitset1.set(4);
	      bitset1.set(63);

	      bitset2.set(10);
	      bitset2.set(20);
	      bitset2.set(30);
	      bitset2.set(40);
	      bitset2.set(64);
	      
	      System.out.println("bitset1: " + bitset1);
	      System.out.println("bitset2: " + bitset2);

	      int size1 = bitset1.size();
	      int size2 = bitset2.size();
	      // print the size of the bitsets
	      System.out.println("size of bitset1: " +size1);
	      System.out.println("size of bitset2: " +size2);
	   }
}

Output:

bitset1: {1, 2, 4, 63}
bitset2: {10, 20, 30, 40, 64}
size of bitset1: 64
size of bitset2: 128

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