how to change a character in a string in java with ascii

1// From Char to Ascii
2char character = 'a';    
3int ascii = (int) character;
4
5// From Ascii to Char
6int ascii = 65;
7char character = (char) ascii;

1// Very simple. Just cast your char as an int.
2
3char character = 'a';    
4int ascii = (int) character;
5
6//In your case, you need to get the specific Character from the String first and then cast it.
7
8char character = name.charAt(0); // This gives the character 'a'
9int ascii = (int) character; // ascii is now 97.
10
11//Though cast is not required explicitly, but its improves readability.
12
13int ascii = character; // Even this will do the trick.

1import java.text.ParseException;
2import java.util.Arrays;
3
4/**
5 * How to convert a String to ASCII bytes in Java
6 * 
7 * @author WINDOWS 8
8 */
9
10public class StringToASCII {
11
12    public static void main(String args[]) throws ParseException {
13        
14        // converting character to ASCII value in Java
15        char A = 'A';
16        int ascii = A;
17        System.out.println("ASCII value of 'A' is  : " + ascii);
18        
19        // you can explicitly cast also
20        char a = 'a';
21        int value = (int) a;
22        System.out.println("ASCII value of 'a' is  : " + value);
23        
24        
25        
26        
27        // converting String to ASCII value in Java
28        try {
29            String text = "ABCDEFGHIJKLMNOP";
30
31            // translating text String to 7 bit ASCII encoding
32            byte[] bytes = text.getBytes("US-ASCII");
33            
34            System.out.println("ASCII value of " + text + " is following");
35            System.out.println(Arrays.toString(bytes));
36            
37        } catch (java.io.UnsupportedEncodingException e) {
38            e.printStackTrace();
39        }
40    }
41
42}
43
44Output
45ASCII value of 'A' is  : 65
46ASCII value of 'a' is  : 97
47ASCII value of ABCDEFGHIJKLMNOP is following
48[65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80]
49
50
51Read more: https://javarevisited.blogspot.com/2015/07/how-to-convert-string-or-char-to-ascii-example.html#ixzz6k2vn7o4y