Java Program to Convert String to Byte Array Using getBytes() Method

Last Updated : 19 Jan, 2021

In Java, strings are objects that are backed internally by a char array. So to convert a string to a byte array, we need a getByte() method. It is the easiest way to convert a string to a byte array. This method converts the given string to a sequence of bytes using the platform's default charset and returns an array of bytes. It is a predefined function of string class. But it is an error-prone method and can return an erroneous result if the platform character encoding doesn't match with the expected encoding.

Syntax:

public byte[] getBytes()

Note:

In this method, the platform's default encoding is used to convert the given string to the byte array if you do not specify any character encoding in the method.
The length of the byte array is not the same as the given string, it depends upon the character encoding.

Example 1:

Java

// Java program to illustrate how to
// convert a string to byte array
// Using getBytes()

import java.io.*;

class GFG {

    public static void main(String[] args)
    {

        // Initializing String
        String ss = "Hello GeeksforGeeks";

        // Display the string before conversion
        System.out.println("String: " + ss);

        // Converting string to byte array
        // Using getBytes() method
        byte[] res = ss.getBytes();

        System.out.println("Byte Array:");

        // Display the string after conversion
        for (int i = 0; i < res.length; i++) {
            System.out.print(res[i]);
        }
    }
}

Output

String: Hello GeeksforGeeks
Byte Array:
72101108108111327110110110711510211111471101101107115

Example 2:

Java

// Java program to illustrate how to
// convert a string to byte array
// Using getBytes()

import java.io.*;
import java.util.Arrays;

class GFG {

    public static void main(String[] args)
    {

        // Initializing String
        String ss = "GeeksforGeeks";

        // Display the string before conversion
        System.out.println("String: " + ss);

        // Converting string to byte array
        // Using getBytes() method
        byte[] res = ss.getBytes();

        // Display the string after conversion
        System.out.println("Byte Array:"
                           + Arrays.toString(res));
    }
}

Output

String: GeeksforGeeks
Byte Array:[71, 101, 101, 107, 115, 102, 111, 114, 71, 101, 101, 107, 115]

Java Program to Convert String to Byte Array Using getBytes() Method

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Java Program to Convert String to Byte Array Using getBytes() Method

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