How to convert String or char to ASCII values in Java — Example Tutorial
You can convert a character like ‘A’ to its corresponding ASCII value 65 by just storing it into a numeric data type like byte, int, or long as shown below :
Here casting is not necessary, simply assigning a character to an integer is enough to store the ASCII value of character into an int variable, but casting improves readability. Since ASCII is a 7-bit character encoding, you don’t even need an integer variable to store ASCII values, byte data type in Java, which is 8 bits wide is enough to store the ASCII value of any character. So you can also do like this :
byte asciiOfB = 'B'; // assign 66 to variable
Since String is nothing but a character array in Java, you can also use this technique to convert a String into ASCII values, as shown below :
StringBuilder sb = new StringBuilder(); char[] letters = str.toCharArray(); for (char ch : letters) < sb.append((byte) ch); > System.out.println(sb.toString()); // print 749711897
You can also directly convert String to a byte array, where bytes will hold ASCII value of characters as shown below :
byte[] ascii = "Java".getBytes(StandardCharsets.US_ASCII); String asciiString = Arrays.toString(ascii); System.out.println(asciiString); // print [74, 97, 118, 97]
You can pass character encoding as «US-ASCII» also, as we have done in our Java example, but using StandardCharsets.US_ASCII is safer because there is no chance of any spelling mistake causing UnsupportedEncodingException . See Core Java Volume 1 10th Edition by Cay S. Horstmann to learn more about String in Java.
Java Program to convert String and char to ASCII
Here is our Java program, which combines all the ways we have seen to convert String and character to their respective ASCII values. You can also use the same technique to convert String to other encoding formats e.g. ISO-8859-X (1-7) , UTF-8, UTF-16BE, UTF-16LE. These are some of the popular encoding formats internally supported by Java.
See class java.nio.charset.Charset and StandardCharsets for more information
Here is an ASCII table for your quick reference :
import java.text.ParseException; import java.util.Arrays; /** * How to convert a String to ASCII bytes in Java * * @author WINDOWS 8 */ public class StringToASCII < public static void main(String args[]) throws ParseException < // converting character to ASCII value in Java char A = 'A'; int ascii = A; System.out.println("ASCII value of 'A' is : " + ascii); // you can explicitly cast also char a = 'a'; int value = (int) a; System.out.println("ASCII value of 'a' is : " + value); // converting String to ASCII value in Java try < String text = "ABCDEFGHIJKLMNOP"; // translating text String to 7 bit ASCII encoding byte[] bytes = text.getBytes("US-ASCII"); System.out.println("ASCII value of " + text + " is following"); System.out.println(Arrays.toString(bytes)); > catch (java.io.UnsupportedEncodingException e) < e.printStackTrace(); > > > Output ASCII value of 'A' is : 65 ASCII value of 'a' is : 97 ASCII value of ABCDEFGHIJKLMNOP is following [65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80]
That’s all guys, now you know how to convert a Java char or String to their ASCII values. Remember, when you store a char data type into numeric types e.g. byte, short, int, or long, their ASCII values are stored. It’s also efficient to use byte data type to store ASCII values because it’s a 7-bit character encoding and byte is enough to store ASCII.
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Convert String to ASCII Java
Convert String to ASCII Java | ASCII expands as American Standard Code For Information Interchange this is widely used to transfer the information or messages between the computers & it usually contains numerical, letters, and also other symbols. ASCII is a character encoding standard for electronic exchange. The ASCII values are case-sensitive hence it has different values for the character ‘a’ and the character ‘A’.
For Example:
ASCII value for ‘A’ = 65
ASCII value for ‘B’ = 66 and so on.
See more:- Java program to display ASCII value of a given character
To convert the string to its equivalent ASCII we have to get the ASCII value of each character. Example:-
String = “KnowProgram”;
ASCII = “751101111198011411110311497109”
String To ASCII Java using String.getBytes()
In Java, the String class contains the getBytes() method which encodes given String into a sequence of bytes using the named charset, storing the result into a new byte array. The below program demonstrate the String.getBytes() method.
import java.util.Arrays; public class Main < public static void main(String args[]) < try < String txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; byte[] bytes = txt.getBytes("US-ASCII"); System.out.println("ASCII: " + Arrays.toString(bytes)); >catch (java.io.UnsupportedEncodingException e) < e.printStackTrace(); >> >ASCII: [ 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90 ]
Using the getBytes() we can get the equivalent ASCII value of the given string by concatenating each byte value from the array. Let us see it through an example:-
import java.util.Arrays; public class Main < public static void main(String args[]) < try < String txt = "KnowProgram"; byte[] bytes = txt.getBytes("US-ASCII"); System.out.println("Bytes array: " + Arrays.toString(bytes)); StringBuilder sb = new StringBuilder(""); for (byte value : bytes) < sb.append(value); >String ascii = sb.toString(); System.out.println("ASCII: " + ascii); > catch (java.io.UnsupportedEncodingException e) < e.printStackTrace(); >> >Bytes array: [75, 110, 111, 119, 80, 114, 111, 103, 114, 97, 109]ASCII: 751101111198011411110311497109