KeyBoard Input Class

11 April 2007

Taking input from keyboard involves various steps. Lot of people ask for some ready made class which will serve the purpose. Following class is a good choice. You can use “readInt()”, “readDouble()”, “readChar()” and “readString()” methods according to your needs.

import java.io.*;
 
public class KeyboardInput {
 
	static BufferedReader stdin =
		new BufferedReader( new InputStreamReader(System.in));
 
	public static int readInt () {
		while (true) {
			try{
				String line = stdin.readLine();
				int value = Integer.parseInt(line);
				return value;
			} catch(java.lang.NumberFormatException e){
				;
			} catch(IOException e){
				;
			}
		}
	} // end readInt ()
 
	public static int readInt (String text) {
		System.out.print(text);
		while (true) {
			try{
				String line = stdin.readLine();
				int value = Integer.parseInt(line);
				return value;
			} catch(java.lang.NumberFormatException e){
				;
			} catch(IOException e){
				;
			}
		}
	} // end readInt (String text)
 
	public static double readDouble () {
		while (true) {
			try {
				String line = stdin.readLine();
				double value = Double.valueOf(line).doubleValue();
				return value;
			} catch (java.lang.NumberFormatException e){
				;
			} catch (IOException e){
				;
			}
		}
	} // end readDouble()
 
	public static char readChar () {
		while (true) {
			try {
				String line = stdin.readLine();
				char value = line.charAt(0);
				return value;
			} catch (IOException e){
				;
			}
		}
	} // end readChar()
 
	public static String readString (){
		while(true) {
			try {
				return stdin.readLine();
			} catch (IOException e) {
				;
			}
		}
	} // end readString()
 
	public static String readString (String text){
		System.out.print(text);
		while(true) {
			try {
				return stdin.readLine();
			} catch (IOException e) {
				;
			}
		}
	} // end readString(String text)
 
}
 
Usage example:
 
       	    char choice = KeyboardInput.readChar();

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2 Responses to “KeyBoard Input Class”

  1. On April 23rd, 2007 at 11:31 pm, Scott Says:

    Hello,

    Just thought i would comment and leave my appreciation. I recently stumbled upon your blog whilst looking for a premade Keyboard input class.

    Thanks for posting!

    Have subsequently used the class in one of my educational projects.

    Thank you very much. Keep up good work. You have a very informative, helpful Blog!!

  2. On July 12th, 2008 at 12:39 pm, Sanjay Maurya Says:

    Hi

    Thank you very much for submitting this wonderful Keyboard class. I compiled and then placed in the same folder where my program was. When I checked for methods readInt and readString, I worked well. But It didn’t work for readChar and compiler issued error for this. Could you correct all and reupload the same?

    Once again, thanks for you for your work

    Sanjay Maurya

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