Java: Convert String to byte array

In this post, you are going to learn,

         a. How to convert string to byte array

         b. How to specify encoding while converting string to byte array

How to convert string to byte array

String class provide 'getBytes' method to convert a string to byte array. This method encode the string to bytes using the platform's default charset.

Example

String str = "Hello World";

byte[] bytes = str.getBytes();

How to specify encoding while converting string to byte array?

'getbytes' method is available in below overloaded forms, where you can specify the encoding (like UTF-8, ASCII) to convert the string to byte array.

public byte[] getBytes(String charsetName)

public byte[] getBytes(Charset charset)

Example

bytes = str.getBytes(Charset.forName("ASCII"));

App.java

package com.sample.app;

import java.nio.charset.Charset;

public class App {

 private static void printByteArray(byte[] bytes) {

  for (byte b : bytes) {
   System.out.print(b + " " + (char) b + "\t");
  }
  System.out.println("");
 }

 public static void main(String args[]) {
  String str = "Hello World";

  byte[] bytes = str.getBytes();
  printByteArray(bytes);

  bytes = str.getBytes(Charset.forName("ASCII"));
  printByteArray(bytes);

 }
}

Output

72 H  101 e 108 l  108 l  111 o 32     87 W 111 o 114 r 108 l  100 d

72 H  101 e 108 l  108 l  111 o 32     87 W 111 o 114 r 108 l  100 d

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