how to know user pressed a key in the keyboard

hi all,

how to know user pressed a key in the keyboard expect using keyListener.
thanks a lot for your help.

Tell us your problem first

im doing console programming in java, and i wanna know how to do the press any key to continue thing, so watever key is pressed then it does something, i know how to read user input but i dont think thats how to do it. Thanks

Use ascii code for your programming

ASCII : Java Glossary
How to obtain ASCII code of a character - Java Forums

i just wanna detect a key press

Each key press will return a key ascii code so u have to find the maximum and minimum Ascii key value form the links i given to you then make a logic like

if( minKeyAscii >= KEY_TYPED && KEY_TYPED <= maximum )

I think this will fix your problem. Try your level best, good luck.

Maybe use the Scanner class.

// Json

Quote:

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Originally Posted by Json

Maybe use the Scanner class.

// Json

---

Something like this?

Code :

---

import java.util.Scanner;
 
public class Cilang {
 
    /**
     * JavaProgrammingForums.com
     */
    public static void main(String[] args) {
 
        System.out.println("Java Programming Forums");
        System.out.println("Continue? (y/n)");
        Scanner sc = new Scanner(System.in);
 
        if(sc.next().equals("y")){
            DoSomething();
        }else{
            System.out.println("Bye!");
        }
 
 
    }
 
    public static void DoSomething(){        
        System.out.println("Hello World!");        
    }    
}

---

Only problem with using the Scanner class like this is you have to press Enter for it to register.

I dont think its possible to just detect one keypress from the System.in inputstream unless the keypress is the return/new line key.

The problem is that the OS does not send the data to the inputstream until the return key is pressed :(

// Json

*cough* JNI.

Quote:

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Originally Posted by Freaky Chris

*cough* JNI.

---

=)) What a surprise!!

Java Native Interface - Wikipedia, the free encyclopedia

Its not my fault there is a large volume of JNI questions flooding into the forum!

haha

*cough* didnt expect that from you *cough*

Maybe we need to start putting together some nice JNI common stuff :)

// Json

Did you just use nice and JNI in the same sentence!?

Possibly :/

// Json

excuse me ., its not related on this post .. but i want to ask something.

i modified javaPF's reply(code) about this thread..

Code :

---

public class Cilang {
 
    /**
     * JavaProgrammingForums.com
     */
    Scanner sca = new Scanner(System.in);
    public static void main(String[] args) {
 
        System.out.println("Java Programming Forums");
        System.out.println("Continue? (y/n)");
        Scanner sc = new Scanner(System.in);
 
        String input = sc.next();
 
        if (input == "y"){
            DoSomething();
        }else{
            System.out.println("Bye!");
        }
 
 
    }
 
    public static void DoSomething(){
        System.out.println("Hello World!");
    }
}

---

i just used some boolean expression THAT IF input has a value which is 'y' then it will do the statement in the if block,

but why isnt running?

im just trying to apply some logic behind that... (i.e. if i entered 'y' then pop it up)

but i ended up in error
it only prints the ELSE statement "bye"

Because this if statement.

Code :

---

if (input == "y") {

---

Should look like this to work.

Code :

---

if ("y".equalsIgnoreCase(input)) {

---

There is another thread somewhere discussing why you shouldnt use the == when comparing strings.

// Json