How to convert String to Byte array in java

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Method syntax:
String getBytes Example:

There is one more overloaded method for getBytes

Sometimes, we need to convert String to byte array. We can use getBytes() method of String to do it,

Method syntax:

public byte[] getBytes()

public byte[] getBytes()

String getBytes Example:

package org.arpit.java2blog;

public class StringBytesExample {
 public static void main(String[] args) {
  String str1 = "java2blog";
  byte[] bytes=str1.getBytes();

  System.out.println(str1.length());
  System.out.println(bytes.length);
  System.out.println(bytes.toString());

 }
}

package org.arpit.java2blog;

public class StringBytesExample {

public static void main(String[] args) {

String str1 = "java2blog";

byte[] bytes=str1.getBytes();

System.out.println(str1.length());

System.out.println(bytes.length);

System.out.println(bytes.toString());

}

When you run above program, you will get below output:

9
9
[B@e1641c0

[B@e1641c0

There is one more overloaded method for getBytes

Method syntax:

public byte[] getBytes(String charSetName)

public byte[] getBytes(String charSetName)

It encodes String to specified charset format. You can read about charset from http://docs.oracle.com/javase/7/docs/api/java/nio/charset/Charset.html

Lets encode above String in charSet UTF-16LE and UTF-16BE

package org.arpit.java2blog;

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

public class StringBytesExample {
 public static void main(String[] args) {
  String str1 = "java2blog";
  byte[] bytesDef=str1.getBytes();
  byte[] bytesUTFLE = null;
  byte[]  bytesUTFBE = null;
  try {
   bytesUTFLE = str1.getBytes("UTF-16LE");
   bytesUTFBE=str1.getBytes("UTF-16BE");
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  }

  System.out.println("Encoding using default charSet");
  for (int i = 0; i < bytesDef.length; i++) {
   System.out.print(bytesDef[i]);
  }
  System.out.println("n----------------------------------");
  System.out.println("nEncoding using UTF-16LE charset");
  for (int i = 0; i < bytesUTFLE.length; i++) {
   System.out.print(bytesUTFLE[i]);
  }
  System.out.println("n----------------------------------");
  System.out.println("nEncoding using UTF-16BE charset");
  for (int i = 0; i < bytesUTFBE.length; i++) {
   System.out.print(bytesUTFBE[i]);
  } 
 }
}

package org.arpit.java2blog;

import java.io.UnsupportedEncodingException;

import java.nio.charset.Charset;

public class StringBytesExample {

public static void main(String[] args) {

String str1 = "java2blog";

byte[] bytesDef=str1.getBytes();

byte[] bytesUTFLE = null;

byte[] bytesUTFBE = null;

try {

bytesUTFLE = str1.getBytes("UTF-16LE");

bytesUTFBE=str1.getBytes("UTF-16BE");

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

}

System.out.println("Encoding using default charSet");

for (int i = 0; i < bytesDef.length; i++) {

System.out.print(bytesDef[i]);

}

System.out.println("n----------------------------------");

System.out.println("nEncoding using UTF-16LE charset");

for (int i = 0; i < bytesUTFLE.length; i++) {

System.out.print(bytesUTFLE[i]);

}

System.out.println("n----------------------------------");

System.out.println("nEncoding using UTF-16BE charset");

for (int i = 0; i < bytesUTFBE.length; i++) {

System.out.print(bytesUTFBE[i]);

}

When you run above program, you will get below output:

Encoding using default charSet
10697118975098108111103
----------------------------------

Encoding using UTF-16LE charset
10609701180970500980108011101030
----------------------------------

Encoding using UTF-16BE charset
01060970118097050098010801110103

Encoding using default charSet

10697118975098108111103

----------------------------------

Encoding using UTF-16LE charset

10609701180970500980108011101030

----------------------------------

Encoding using UTF-16BE charset

01060970118097050098010801110103

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How to convert String to Byte array in java

Method syntax:

String getBytes Example:

There is one more overloaded method for getBytes

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Method syntax:

String getBytes Example:

There is one more overloaded method for getBytes

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