Java BitSet nextClearBit() method

The nextClearBit(int fromIndex) method of Java BitSet class returns the index of first bit which is set to false that occurs on or after the specified index.

Syntax:

Parameter:

DataType	Parameter	Description
int	fromIndex	It is an index of BitSet from which the checking of clear bit starts.

Returns:

This method returns the index of the next clear bit.

Exception:

IndexOutOfBoundsException - throw an exception if the specified index is negative.

Compatibility Version:

Java 1.4 and above

Example 1

import java.util.BitSet;

public class BitSetNextClearBitExample1 {
	public static void main(String[] args) {
		BitSet bitset = new BitSet(5);
		
		bitset.set(0);
		bitset.set(1);
		bitset.set(3);
		bitset.set(4);
		
		System.out.println("bitset: "+bitset);
		
		int indexofClearBit1 = bitset.nextClearBit(3);
		int indexofClearBit2 = bitset.nextClearBit(0);
		int indexofClearBit3 = bitset.nextClearBit(2);
		
		System.out.println("clear bit next to 3: "+indexofClearBit1);
		System.out.println("clear bit next to 0: "+indexofClearBit2);
		System.out.println("clear bit next to 2: "+indexofClearBit3);
	}
}

Output:

bitset: {0, 1, 3, 4}
clear bit next to 3: 5
clear bit next to 0: 2
clear bit next to 2: 2

Example 2

The nextClearBit(int fromIndex) method throws an exception if the specified index is negative.

import java.util.BitSet;

public class BitSetNextClearBitExample2 {
	public static void main(String[] args) {
		BitSet bitset = new BitSet(5);
		
		bitset.set(0);
		bitset.set(1);
		bitset.set(3);
		bitset.set(4);
			
		System.out.println("bitset: "+bitset);
		//throws an exception for negative index
		int indexofClearBit = bitset.nextClearBit(-1);
		System.out.println("clear bit next to -1: "+indexofClearBit);
	}
}

Output:

Exception in thread "main" java.lang.IndexOutOfBoundsException: fromIndex < 0: -1
	at java.util.BitSet.nextClearBit(Unknown Source)
	at BitSetNextClearBitExample2.main(BitSetNextClearBitExample2.java:14)
bitset: {0, 1, 3, 4}

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