Input

[Kid Programmer]

How does the input function in java work?

[pronerd]

How does the input function in java work?

What input method, in what object, in what library?

[Kid Programmer]

What input method, in what object, in what library?

Input for strings and numbers. I don't know how to answer your questions. I'm new to java. Just do any of them.

[pronerd]

Input for strings and numbers. I don't know how to answer your questions. I'm new to java. Just do any of them.

Neither String or Number class has an input method. What is it you are trying to do?

[Ganon11]

Are you possibly asking how to input in Java?

[Kid Programmer]

All I want to know is how you can prompt the user to enter a number or string.

[Laharl]

Prompting (aka output) can be done through System.out.prin tln(), or System.out.prin t() if you don't want the newline. As to input, Scanner is what you want. You also might want to look at Sun's Java tutorials for all sorts of useful information.

[BigDaddyLH]

If you're using 1.6, I like java.io.Console in simple situations: http://java.sun.com/javase/6/docs/ap...o/Console.html

[Kid Programmer]

System.out.prin tln and System.out.prin t simply make a message appear. I want the user to actually be able to enter something. In the language python for example the command would be:

blah = input("please enter a number or word: ")

[Laharl]

Hence the link to the Scanner class I posted. The example code there shows how to use it as console-based input. Just remember to put 'import java.util.Scann er;' at the top of your file to use it. You have to use two commands to do the same thing as input("blah") in Python. One to output the string, one to read the input from the user.

[Kid Programmer]

Okay I got it to work. Thanks. One more question. Is it possible to have the user only input a number.

[sukatoa]

Okay I got it to work. Thanks. One more question. Is it possible to have the user only input a number.

In console? That is impossible... but you can prompt the user if it is a wrong input.....

regards,
sukatoa

[Kid Programmer]

In console? That is impossible... but you can prompt the user if it is a wrong input.....

regards,
sukatoa

How can you prompt the user if it is a wrong input?

[sukatoa]

How can you prompt the user if it is a wrong input?

Capture the user's input... ( variable should handle this )...

Compare it with what you want.... since it should be a number....

Convert it first into arrays of characters.
Loop in every element and compare it with digits... ( depends on how you will implement them )....

or simply put a try/catch block inside the conversion code...

try{
     int digit = new java.util.Scanner(System.in).nextInt();
}catch(InputMismatchException em){
     new javax.swing.JOptionPane().showMessageDialog(null,
               "BAD INPUT!!");
}

regards,
sukatoa

[Laharl]

You can also use the Scanner's hasNextInt() method with a while loop to check if the user has entered an integer before you try to grab it or parse it at all.