Java.lang.String.getByte() in Java

Last Updated : 09 Aug, 2017

getbytes() function in java is used to convert a string into sequence of bytes and returns an array of bytes. This function can be implemented in two ways. Both the ways are discussed in this article.

Syntax 1 – public byte[] getBytes() : This function takes no arguments and used default charset to encode the string into bytes.

// Java code to demonstrate the working of
// getByte()
public class GetByte {
  
public static void main(String args[])
    {
        // Initializing String
        String gfg = "ASTHA GFG";
  
        // Displaying string values before
        // conversion
        System.out.println("The String before conversion is : ");
        System.out.println(gfg);
  
        // converting the string into byte
        // using getBytes ( converts into ASCII values )
        byte[] b = gfg.getBytes();
  
        // Displaying converted string after conversion
        System.out.println("The String after conversion is : ");
        for (int i = 0; i < b.length; i++) {
            System.out.print(b[i]);
        }
    }
}

Output:

The String before conversion is : 
ASTHA GFG
The String after conversion is : 
658384726532717071

Syntax 2 : public byte[] getBytes(Charset charset): This implementation accepts the charset according to which string has to be encoded while conversion into bytes. There are many charset defined and are discussed below.

US-ASCII: Seven-bit ASCII, a.k.a. ISO646-US, a.k.a. the Basic Latin block of the Unicode character set
ISO-8859-1: ISO Latin Alphabet No. 1, a.k.a. ISO-LATIN-1
UTF-8: Eight-bit UCS Transformation Format
UTF-16BE: Sixteen-bit UCS Transformation Format, big-endian byte order
UTF-16LE: Sixteen-bit UCS Transformation Format, little-endian byte order
UTF-16: Sixteen-bit UCS Transformation Format, byte order identified by an optional byte-order mark.

// Java code to demonstrate the working of
// getByte() using different character sets
import java.io.*;
public class GetBytecharset {
  
public static void main(String args[])
    {
        // Initializing String
        String gfg = new String("ASTHA GFG");
  
        // Displaying string values before
        // conversion
        System.out.println("The String before conversion is : ");
        System.out.println(gfg);
  
        try {
  
            // converting the string into byte
            // using getBytes ( converts into UTF-16 values )
            byte[] b = gfg.getBytes("UTF-16");
  
            // Displaying converted string after conversion
            // into UTF-16
            System.out.println("The String after conversion into UTF-16 is : ");
            for (int i = 0; i < b.length; i++) {
                System.out.print(b[i]);
            }
  
            System.out.print("\n");
  
            // converting the string into byte
            // using getBytes ( converts into UTF-16BE values )
            byte[] c = gfg.getBytes("UTF-16BE");
  
            // Displaying converted string after conversion
            // into UTF-16BE
            System.out.println("The String after conversion into UTF-16BE is : ");
            for (int i = 0; i < c.length; i++) {
                System.out.print(c[i]);
            }
        }
        catch (UnsupportedEncodingException g) {
            System.out.println("Unsupported character set" + g);
        }
    }
}

Output:

The String before conversion is : 
ASTHA GFG
The String after conversion into UTF-16 is : 
-2-1065083084072065032071070071
The String after conversion into UTF-16BE is : 
065083084072065032071070071

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