Java.util.BitSet.clear() in Java

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There are three variants of clear() method:

clear() : The clear() method sets all of the bits in this BitSet to false.

public void clear()
Return Value
This method does not return a value.

// Java code to demonstrate the working
// of clear() in BitSet
import java.util.*;
public class BitClr1 {
public static void main(String[] args)
    {
  
        // Declaring Bitset
        BitSet bset = new BitSet(8);
  
        // assigning values to bitset
        for (int i = 0; i < 5; i++)
            bset.set(i);
  
        // printing original bitset
        System.out.println
        ("The bitset before clear() operation is : " + bset);
  
        // using clear() to clear contents of bitset
        bset.clear();
  
        // printing bitset after clear() operation
        // empty bitset
        System.out.println
        ("The bitset after clear() operation is : " + bset);
    }
}

Output:

The bitset before clear() operation is : {0, 1, 2, 3, 4}
The bitset after clear() operation is : {}

clear(int pos) : The clear(int pos) method sets the bit specified by the index to false. i.e removes from bitset.

public void clear(int pos)
Parameters
   pos : the index of the bit to be cleared.
Return Value
This method does not return a value.
Exception
   IndexOutOfBoundsException : if the specified index is negative.

// Java code to demonstrate the working
// of clear(int pos) in BitSet
import java.util.*;
public class BitClr2 {
public static void main(String[] args)
    {
  
        // Declaring Bitset
        BitSet bset = new BitSet(8);
  
        // assigning values to bitset
        for (int i = 0; i < 5; i++)
            bset.set(i);
  
        // printing original bitset
        System.out.println
        ("The bitset before clear(pos) operation is : " + bset);
  
        // using clear(pos) to clear element at specified position
        bset.clear(3);
  
        // printing bitset after clear(pos) operation
        // removes 3
        System.out.println
        ("The bitset after clear(pos) operation is : " + bset);
    }
}

Output:

The bitset before clear(pos) operation is : {0, 1, 2, 3, 4}
The bitset after clear(pos) operation is : {0, 1, 2, 4}

clear(int frompos, int topos) : The clear(int frompos, int topos) method sets the bits from the specified frompos (inclusive) to the specified topos (exclusive) to false i.e performs removal in a range.

public void clear(int frompos, int topos)
Parameters
    frompos : index of the first bit to be cleared
    topos : index of the last bit to be cleared
Return Value
This method does not return a value.
Exception
    IndexOutOfBoundsException: if frompos is negative, 
or topos is negative, or frompos is larger than topos.

// Java code to demonstrate the working
// of clear(int frompos, int topos) in BitSet
import java.util.*;
public class BitClr3 {
public static void main(String[] args)
    {
  
        // Declaring Bitset
        BitSet bset = new BitSet(8);
  
        // assigning values to bitset
        for (int i = 0; i < 5; i++)
            bset.set(i);
  
        // printing original bitset
        System.out.println
        ("The bitset before clear(frompos, topos) operation is : " + bset);
  
        // using clear(frompos, topos) to clear elements in range
        bset.clear(2, 4);
  
        // printing bitset after clear(frompos, topos) operation
        // removes 2, 3
        System.out.println
        ("The bitset after clear(frompos, topos) operation is : " + bset);
    }
}

Output:

The bitset before clear(frompos, topos) operation is : {0, 1, 2, 3, 4}
The bitset after clear(frompos, topos) operation is : {0, 1, 4}

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