How to convert input char to uppercase automatically in Java

Question

I am using a Scanner class to get the input and want to convert the input to uppercase letter when display it. This is my code

Scanner input = new Scanner(System.in);
System.out.print("Enter a letter: ");
char c = input.next().charAt(0);
Character.toUpperCase(c);

Since I have convert it to uppercase, but the output is like

input: a
c = A;
output: Enter a letter: a

PS: The letter "a" is what I typed in the terminal

However I want to it display as an uppercase one. How can I change it?

Solution 1

The toUpperCase method doesn't change the value of the char (it can't); it returns the uppercased char. Change

Character.toUpperCase(c);

to

c = Character.toUpperCase(c);

UPDATE

The updated question now indicates that the uppercased characters are to be printed as they're typed. Java cannot do that, because Java doesn't control how the O/S echoes user input to the screen. My solution above would only produce additional output, even if it is uppercased.

Solution 2

System.out.println(Character.toUpperCase(c));

Comments

[Boris the Spider]

Not sure this is the problem. The OP wants the echo on the tty to automatically uppercase characters as they are typed.

[matchaGerry]

Yes, thanks a lot. But I am still wondering about the display of the input after changing my code.

[Boris the Spider]

@matchaGerry sadly that is impossible from Java.

[rgettman]

@matchaGerry The TTY part was not evident from your question. Please update the question.

[matchaGerry]

@rgettman Ok I have updated it. Anyway, thank your answer it is a problem in my code.

[matchaGerry]

@BoristheSpider since you have told me that it is impossible from Java I think I need to change it when I type.