Java BitSet length() Method

---

Description

The Java BitSet length() method returns the "logical size" of this BitSet: the index of the highest set bit in the BitSet plus one. Returns zero if the BitSet contains no set bits.

Declaration

Following is the declaration for java.util.BitSet.length() method

public int length()

Parameters

NA

Return Value

This method returns the logical size of this BitSet.

Exception

NA

Example 1

The following example shows the usage of Java BitSet length() method. We're creating two BitSets. We're setting true values in a BitSet object using set() method call and using length() method we're checking the logical length of each bitset.

package com.tutorialspoint;
import java.util.BitSet;
public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = new BitSet();
      BitSet bitset2 = new BitSet();

      // assign values to bitset1
      bitset1.set(0, 6, true);
	  
      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);

      // print the length of bitsets
      System.out.println("Bitset1 length :" + bitset1.length());
      System.out.println("Bitset2 length :" + bitset2.length());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{0, 1, 2, 3, 4, 5}
Bitset2:{}
Bitset1 length :6
Bitset2 length :0

Example 2

The following example shows the usage of Java BitSet length() method. We're creating two BitSets using byte[] and using length() method we're checking the logical length of the bitsets.

package com.tutorialspoint;
import java.util.BitSet;
public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = BitSet.valueOf(new byte[] { 0, 1, 2, 3, 4, 5 });
      BitSet bitset2 = new BitSet();

      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);
      
      // print the length of bitsets
      System.out.println("Bitset1 length :" + bitset1.length());
      System.out.println("Bitset2 length :" + bitset2.length());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{8, 17, 24, 25, 34, 40, 42}
Bitset2:{}
Bitset1 length :43
Bitset2 length :0

Example 3

The following example shows the usage of Java BitSet length() method. We're creating two BitSets using long[] and using length() method we're checking the logical length of the bitsets.

package com.tutorialspoint;
import java.util.BitSet;
public class BitSetDemo {
   public static void main(String[] args) {

      // create 2 bitsets
      BitSet bitset1 = BitSet.valueOf(new long[] { 0, 1, 2, 3, 4, 5 });
      BitSet bitset2 = new BitSet();

      // print the sets
      System.out.println("Bitset1:" + bitset1);
      System.out.println("Bitset2:" + bitset2);

      // print the length of bitsets
      System.out.println("Bitset1 length :" + bitset1.length());
      System.out.println("Bitset2 length :" + bitset2.length());
   }
}

Let us compile and run the above program, this will produce the following result −

Bitset1:{64, 129, 192, 193, 258, 320, 322}
Bitset2:{}
Bitset1 length :323
Bitset2 length :0