Convert String to Byte Array in Java Using getBytes(Charset) Method Last Updated : 22 Nov, 2024 Comments Improve Suggest changes Like Article Like Report To convert a string to a byte array, we use the getBytes(Charset) method In Java that transforms the string into a sequence of bytes based on a specified character encoding. This method returns the byte array and relies on the Charset class to handle character-to-byte mappings.Example: Java // Java program to convert a String to a byte array // using getBytes(Charset) method with UTF-8 encoding import java.nio.charset.StandardCharsets; public class StringToByteArray { public static void main(String[] args) { // sample string String s = "hello"; // Convert string to byte array using UTF-8 encoding byte[] b = s.getBytes(StandardCharsets.UTF_8); // Print the byte array for (byte b1 : b) { System.out.print(b1 + " "); } } } Output104 101 108 108 111 Explanation: The above program converts the string "hello" into a byte array using UTF-8 encoding by using the getBytes(StandardCharsets.UTF_8) method. Then it prints each byte of the resulting byte array.Syntax of getBytes(Charset) Methodbyte[] byteArray = string.getBytes(Charset charset);Parameter: charset is the character set used to encode the string. For example, StandardCharsets.UTF_8 or Charset.forName("UTF-8").Return type: This function returns the resulting byte array. Important Points:This method always replaces malformed input and unmappable character sequence with its charset's default replacement byte array.If the given charset is not a valid charset, then this method will throw UnsupportedEncodingException.The length of the byte array is not the same as the given string, it depends upon the character encoding.Other Ways to Convert a String to Byte Array Using getBytes(Charset)1. Convert String to Byte Array Using UTF-16 CharsetExample: Java // Java Program to illustrate how to // convert a string to byte array // Using getBytes(Charset charset) import java.io.*; class GFG { public static void main (String[] args) { String s = "Hello GeeksforGeeks"; // Display the string before conversion System.out.println("String: " + s); try { // Converting string to byte array // Using getBytes(Charset charset) method // Here, we convert the string into UTF-16 values byte[] r = s.getBytes("UTF-16"); // Displaying the converted string after // conversion into UTF-16 System.out.println("Result: "); for (int i = 0; i < r.length; i++) { System.out.print(r[i] + " "); } } catch (Exception e) { System.out.println("Error: " + e); } } } OutputString: Hello GeeksforGeeks Result: -2 -1 0 72 0 101 0 108 0 108 0 111 0 32 0 71 0 101 0 101 0 107 0 115 0 102 0 111 0 114 0 71 0 101 0 101 0 107 0 115 Explanation: The above example converts the string "Hello GeeksforGeeks" into a byte array using the UTF-16 charset with the getBytes("UTF-16") method. Then it prints each byte of the resulting byte array to the console.2. Convert String to Byte Array Using US-ASCII CharsetExample: Java // Java Program to illustrate how to // convert a string to byte array // Using getBytes(Charset charset) import java.io.*; import java.util.Arrays; class GFG{ public static void main (String[] args) { String s1 = "Hello GFG"; // Display the string before conversion System.out.println("String: " + s1); try { // Converting string to byte array // Using getBytes(Charset charset) method // Here, we converts into US-ASCII values byte[] r = s1.getBytes("US-ASCII"); // Displaying converted string after conversion // into US-ASCII System.out.println("Byte Array: " + Arrays.toString(r)); } catch (UnsupportedEncodingException g) { System.out.println("Unsupported character set" + g); } } } OutputString: Hello GFG Byte Array: [72, 101, 108, 108, 111, 32, 71, 70, 71] Explanation: The above example converts the string "Hello GFG" into a byte array using the US-ASCII charset with the getBytes("US-ASCII") method. Then it prints the resulting byte array using Arrays.toString() to display the ASCII values of the characters. Comment More infoAdvertise with us Next Article Convert String to Byte Array in Java Using getBytes(Charset) Method ankita_saini Follow Improve Article Tags : Java Java Programs Java-Strings Java-Arrays Java-Array-Programs Java-String-Programs +2 More Practice Tags : JavaJava-Strings Similar Reads Convert String to Byte Array in Java Using getBytes(encoding) Method In Java, any sequence of characters within double quotes is treated as String literal. String class represents the character string literal. The string class is present in java.lang package. All string literals in java are immutable i.e their value cannot be changed once created. In Java, the string 3 min read Java Program to Convert String to Byte Array Using getBytes() Method In Java, strings are objects that are backed internally by a char array. 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