Java BigInteger toByteArray() method

The toByteArray() method of Java BigInteger class is used to find the binary representation of this BigInteger in the form of byte array. A byte array contains the minimum number of bytes required to represent this BigInteger, including at least one sign bit, which is (ceil((this.bitLength() + 1)/8)).

Syntax:

Parameter:

Returns:

This method returns a byte array containing the 2's complement representation of this BigInteger.

Exception:

Note: The byte array will be in big-endian byte-order: the most significant byte is present as the 0th element. For example: 0x10,0x14 etc.

Example 1

import java.math.BigInteger;
public class BigIntegerToByteArrayExample1 {
	public static void main(String[] args) {
		// create a BigInteger object
        BigInteger big1;
        // create a byte array object
        byte[] byteArray;
        // assign value to big1
        big1 = new BigInteger("20");
        // assign byte array representation of big1 to byteArray
        byteArray = big1.toByteArray();
        String str = "Byte array representation of "+big1+" is: ";
        System.out.print(str);
        // print byte array byteArray using for loop
        for(int i=0;i<byteArray.length;i++){
        	System.out.format("0x%02X ", byteArray[i]);
        	}
     }
}

Test it Now

Output:

Byte array representation of 20 is: 0x14

Example 2

import java.math.BigInteger;
public class BigIntegerToByteArrayExample2 {
	public static void main(String[] args) {
		// create a BigInteger object
        BigInteger big1;
        // create a byte array object
        byte[] byteArray;
        // assign value to big1
        big1 = new BigInteger("255");
        // assign byte array representation of big1 to byteArray
        byteArray = big1.toByteArray();
        String str = "Byte array representation of "+big1+" is: ";
        System.out.print(str);
        // print byte array byteArray using for loop
        for(int i=0;i<byteArray.length;i++){
        	System.out.format("0x%02X ", byteArray[i]);
        	}
     }
}

Test it Now

Output:

Byte array representation of 255 is: 0x00 0xFF

Example 3

import java.math.BigInteger;
public class BigIntegerToByteArrayExample3 {
	public static void main(String[] args) {
		// create a BigInteger object
        BigInteger big1;
        // create a byte array object
        byte[] byteArray;
        // assign value to big1
        big1 = new BigInteger("65535");
        // assign byte array representation of big1 to byteArray
        byteArray = big1.toByteArray();
        String str = "Byte array representation of "+big1+" is: ";
        System.out.print(str);
        // print byte array byteArray using for loop
        for(int i=0;i<byteArray.length;i++){
        	System.out.format("0x%02X ", byteArray[i]);
        	}
     }
}

Test it Now

Output:

Byte array representation of 65535 is: 0x00 0xFF 0xFF

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Java BigInteger toByteArray() method

Syntax:

Parameter:

Returns:

Exception:

Note: The byte array will be in big-endian byte-order: the most significant byte is present as the 0th element. For example: 0x10,0x14 etc.

Example 1

Example 2

Example 3