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Java.util.BitSet.clear() in Java

  • Last Updated : 16 Aug, 2018

There are three variants of clear() method:

  1. 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 : {}
    
  2. 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}
    
  3. 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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