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How to convert String to Byte Array 

The following example shows converting String to Byte array. String class provides the following APIs for encoding String into a sequence of bytes.

java.lang.String
  • public byte[] getBytes()
    Encodes this String to byte array with default Charset.
  • public byte[] getBytes(String charsetName)
    Encodes this String to byte array with given Charset name.
  • public byte[] getBytes(Charset charset)
    Encodes this String to byte array with given Charset.

File Name  :  
com/bethecoder/articles/basics/str2bytea/String2ByteArrayTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.articles.basics.str2bytea;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Arrays;

public class String2ByteArrayTest {

  /**
   @param args
   @throws UnsupportedEncodingException 
   */
  public static void main(String[] argsthrows UnsupportedEncodingException {

    //Get the bytes encoded in default charset, Charset.defaultCharset()
    String str = "BE THE CODER";
    byte [] bytes = str.getBytes();
    System.out.println(Arrays.toString(bytes));
    
    //Get the bytes encoded in UTF-16 charset
    byte [] bytes2 = str.getBytes("UTF-16");
    System.out.println(Arrays.toString(bytes2));
    
    //Get the bytes encoded in IBM420 charset
    byte [] bytes3 = str.getBytes(Charset.forName("IBM420"));
    System.out.println(Arrays.toString(bytes3));
  
  }

}
   

It gives the following output,
[66, 69, 32, 84, 72, 69, 32, 67, 79, 68, 69, 82]
[-2, -1, 0, 66, 0, 69, 0, 32, 0, 84, 0, 72, 0, 69, 0, 32, 0, 67, 0, 79, 0, 68, 0, 69, 0, 82]
[-62, -59, 64, -29, -56, -59, 64, -61, -42, -60, -59, -39]


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