输入字符串并转换为ASCII

Question

My problem is that when i input "b" it converts correctly but when i input other letters it just displaying the conversion of "b"

char ch = 'b';
int ascii = ch;
int castAscii = (int) ch;
DisplayText.setText(UserInput.getText() + " = " + castAscii); 

Answer 1

This is because you only convert the character b to it's ascii value and not the actual user input. Assuming that UserInput.getText() returns the user defined character as character and not string:

int castAscii = (int) UserInput.getText();
DisplayText.setText(UserInput.getText() + " = " + castAscii); 

In case UserInput.getText() returns a string, you can convert it into a character array and then iterate through it to combine the output.

String userInput = UserInput.getText();
String output = userInput + "=";
for (int i = 0; i < userInput.length(); i++) {
    int castAscii = (int) userInput.toCharArray()[i];
    output  += castAscii;
    if (i < userInput.length()) {
        output += ",";
    } 
}
DisplayText.setText(output); 

Using a framework like apache commons-lang would make for a more elegant solution, but this will work.

Answer 2

you set the ch='b'.so always you convert the "b" and ignore the input.

you must set the ch to what the user entered.

as I mentioned in comments,this is an example code to clarify the process.

    String s = "hello";
    char[] chars = s.toCharArray();
    for (int i = 0; i < chars.length; i++) {
        System.out.println(chars[i]);
        int ascii = (int) chars[i];
        System.out.println(ascii);
    }

you can write scanner.nextline() instead of "hello" next to String s to get the string from the user.