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Showing content from https://www.tutorialspoint.com/java/util/bitset_tobytearray.htm below:

Java BitSet toByteArray() Method

Java BitSet toByteArray() Method Description

The Java BitSet toByteArray() method returns a new byte array containing all the bits in this bit set.

Declaration

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

public byte[] toByteArray()

Parameters

Return Value

This method Returns a new byte array containing all the bits in this bit set.

Exception

Getting Arrays of bytes from a BitSet Example

The following example shows the usage of Java BitSet toByteArray() method. We're creating two BitSets. We're setting true values at given indexes to the BitSet objects using set() method calls per index and using toByteArray() method we're getting and printing the length of the byte arrays.

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);

      // assign values to bitset2
      bitset2.set(2);
      bitset2.set(4);
      bitset2.set(6);
      bitset2.set(8);
      bitset2.set(10);

      System.out.println(bitset1.toByteArray().length);
      System.out.println(bitset2.toByteArray().length);
   }
}

Output

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

1
2

Getting Arrays of bytes from a BitSet of Bytes Example

The following example shows the usage of Java BitSet toByteArray() method. We're creating two BitSets using byte[] and using toByteArray() method we're printing the length of the byte arrays 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 = BitSet.valueOf(new byte[] { 2, 4, 6, 8, 10 });
      
      System.out.println(bitset1.toByteArray().length);
      System.out.println(bitset2.toByteArray().length);
   }
}

Output

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

6
5

Getting Arrays of bytes from a BitSet of Longs Example

The following example shows the usage of Java BitSet toByteArray() method. We're creating two BitSets using long[] and using toByteArray() method we're printing the length of the byte arrays 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 = BitSet.valueOf(new long[] { 2, 4, 6, 8, 10 });
      
      System.out.println(bitset1.toByteArray().length);
      System.out.println(bitset2.toByteArray().length);
   }
}

Output

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

41
33

java_util_bitset.htm

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