CS118: Programming for Computer Scientists

One example of text-based input and output

An example of text-based input and output follows. Each text book provides its own method for dealing with this, and there is no single way of doing it.

import java.io.*;

public class ReadStuff {
   public static void main(String[] args) throws IOException {
   // Create input stream in using stdin.
   BufferedReader in = new BufferedReader(
      new InputStreamReader(System.in));

   // String to store user's input
   String userInput;

   // Give a prompt
   System.out.print("Enter a string: ");

   // Read a line of input
   userInput = in.readLine();

   // Check it worked
   System.out.println("You typed: " + userInput);

   // Now read an int (using Integer to convert between String and int) 
   // to store user's input. Classes Double, Float and Long allow 
   // conversion between conversion between String and double etc.
   System.out.print("Enter an integer: ");

   userInput = in.readLine();
   Integer y = new Integer(userInput);
   int x = y.intValue();

   // Check it worked
   System.out.println("Your integer was: " + x);

   }
}