In Java, getBytes() encodes a string into a sequence of bytes using the named character set and storing the result into a new byte array. This function can be implemented in two ways. Both ways are discussed below as follows:
- getBytes()
- getBytes(Charset charset)
Let us discuss and implement the first use case which is as follows:
Java String getBytes()
This function takes no arguments and used the default charset to encode the string into bytes. getbytes() function in Java is used to convert a string into a sequence of bytes and returns an array of bytes.Â
Syntax
public byte[] getBytes()
Example 1:
Java
// Java Program to Demonstrate// Working of getByte() MethodÂ
// Importing required classesimport java.util.*;Â
// Main class// GetBytepublic class GFG {    // Main driver method    public static void main(String args[])    {        // Declaring and initializing a string        String gfg = "Geeks for Geeks";Â
        // Displaying string values before conversion        System.out.println(            "The String before conversion is : ");        System.out.println(gfg);Â
        // Converting the string into byte        // using getBytes() method        byte[] b = gfg.getBytes();Â
        // Display message only        System.out.println(            "The String after conversion is : ");Â
        // Printing converted string after conversion        for (int i = 0; i < b.length; i++) {            System.out.print(b[i]);        }    }} |
Output
The String before conversion is : Geeks for Geeks The String after conversion is : 71101101107115321021111143271101101107115
Java String getBytes(Charset charset)
Now let us implement and accept the charset according to which string has to be encoded while conversion into bytes. There are many charset defined and are discussed below.Â
Syntax
public byte[] getBytes(Charset charset);
- 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.
Example
Java
// Java code to Illustrate Working of getByte() Method// using Different Character SetsÂ
// Importing required classesimport java.io.*;Â
// Main classpublic class GFG {Â
    // Main driver method    public static void main(String args[])    {Â
        // Declaring and initializinga string        String gfg = new String("Geeks for Geeks");Â
        // Displaying string values before conversion        System.out.println(            "The String before conversion is : ");        System.out.println(gfg);Â
        // Try block to check for exceptions        try {Â
            // Converting the string into byte            // using getBytes() method            byte[] b = gfg.getBytes("UTF-16");Â
            // Displaying converted string            // after conversion into UTF-16            System.out.println(                "The String after conversion into UTF-16 is : ");Â
            // Iterating over the string            for (int i = 0; i < b.length; i++) {                System.out.print(b[i]);            }Â
            System.out.print("\n");Â
            // Converting the above string into byte            // using getBytes() method            byte[] c = gfg.getBytes("UTF-16BE");Â
            // Displaying converted string            // after conversion into UTF-16BE            System.out.println(                "The String after conversion into UTF-16BE is : ");Â
            for (int i = 0; i < c.length; i++) {                System.out.print(c[i]);            }        }Â
        // Catch block to handle exceptions        catch (UnsupportedEncodingException g) {Â
            // Display message when exceptions occurs            System.out.println("Unsupported character set"                               + g);        }    }} |
Output
The String before conversion is : Geeks for Geeks The String after conversion into UTF-16 is : -2-107101010101010701150320102011101140320710101010101070115 The String after conversion into UTF-16BE is : 07101010101010701150320102011101140320710101010101070115
