Java BitSet previousSetBit() method

The previousSetBit(int fromIndex) method of Java BitSet class returns the index of the nearest bit which is set to true that occurs on or before the specified index. It returns -1 if the specified index is negative or no such set bit exists in the BitSet.

Syntax:

Parameter:

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

Returns:

This method returns the index of the previous set bit, or -1 if there is no such set bit exists.

Exception:

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

Compatibility Version:

Java 1.7 and above

Example 1

import java.util.BitSet;

public class BitSetPreviousSetBitExample1 {
	public static void main(String[] args) {
		BitSet bitset = new BitSet(5);
		
		bitset.set(0);
		bitset.set(1);
		bitset.set(4);
		bitset.set(6);
		bitset.set(7);
			
		System.out.println("bitset: "+bitset);
		
		int previousSetBit1 = bitset.previousSetBit(4);
		int previousSetBit2 = bitset.previousSetBit(5);
		
		System.out.println("previous set bit on or before 4: "+previousSetBit1);
		System.out.println("previous set bit on or before 5: "+previousSetBit2);
	}
}

Output:

bitset: {0, 1, 4, 6, 7}
previous set bit on or before 4: 4
previous set bit on or before 5: 4

Example 2

The previousSetBit(int fromIndex) method returns -1 if the specified index is negative.

import java.util.BitSet;

public class BitSetPreviousSetBitExample2 {
	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);
		//returns -1 if provide negative index
		int previousSetBit = bitset.previousSetBit(-1);
		System.out.println("previous set bit previous to -1: "+previousSetBit);
	}
}

Output:

bitset: {0, 1, 3, 4}
previous set bit previous to -1: -1

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Java BitSet previousSetBit() method

Syntax:

Parameter:

Returns:

Exception:

Compatibility Version:

Example 1

Example 2

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Java BitSet previousSetBit() method

Syntax: