Open In App

BitSet toByteArray() Method in Java with Examples

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Share
Report issue
Report

The java.util.BitSet.toByteArray() is an inbuilt method of BitSet class that is used to produce a new byte array containing all of the bits of the existing BitSet. As per the official documentation, this process works in the following way:

if, byte[] bytes = bit_set.toByteArray();
then, bytes.length == (bit_set.length()+7)/8 and,
bit_set.get(n) == ((bytes[n/8] & (1<<(n%8))) != 0)

For all n < 8 * bytes.length

Syntax:

Bit_Set.toByteArray()

Parameter: The method does not take any parameters.

Return value: The method returns the set consisting of ByteArray representation of the elements of the given BitSet.

Below programs illustrate the working of java.util.BitSet.toByteArray() method:
Program 1:




// Java code to illustrate toByteArray()
import java.util.*;
  
public class BitSet_Demo {
    public static void main(String args[])
    {
        // Creating an empty BitSet
        BitSet init_bitset = new BitSet();
  
        // Use set() method to add elements into the Set
        init_bitset.set(10);
        init_bitset.set(20);
        init_bitset.set(30);
        init_bitset.set(40);
        init_bitset.set(50);
  
        // Displaying the BitSet
        System.out.println("BitSet: " + init_bitset);
  
        byte[] arr = init_bitset.toByteArray();
        System.out.println("The byteArray is: " + arr);
  
        // Displaying the byteArray
        System.out.println("The elements in the byteArray :");
        for (int i = 0; i < arr.length; i++)
            System.out.print(arr[i] + ", ");
    }
}


Output:

BitSet: {10, 20, 30, 40, 50}
The byteArray is: [B@232204a1
The elements in the byteArray :
0, 4, 16, 64, 0, 1, 4,

Program 2:




// Java code to illustrate toByteArray()
import java.util.*;
  
public class BitSet_Demo {
    public static void main(String args[])
    {
        // Creating an empty BitSet
        BitSet init_bitset = new BitSet();
  
        // Use set() method to add elements into the Set
        init_bitset.set(48);
        init_bitset.set(64);
        init_bitset.set(15);
        init_bitset.set(95);
        init_bitset.set(105);
        init_bitset.set(21);
  
        // Displaying the BitSet
        System.out.println("BitSet: " + init_bitset);
  
        byte[] arr = init_bitset.toByteArray();
        System.out.println("The byteArray is: " + arr);
  
        // Displaying the byteArray
        System.out.println("The elements in the byteArray :");
        for (int i = 0; i < arr.length; i++)
            System.out.print(arr[i] + ", ");
    }
}


Output:

BitSet: {15, 21, 48, 64, 95, 105}
The byteArray is: [B@232204a1
The elements in the byteArray :
0, -128, 32, 0, 0, 0, 1, 0, 1, 0, 0, -128, 0, 2,


Last Updated : 27 Dec, 2018
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads