Nikos Maravitsas

About Nikos Maravitsas

Nikos has graduated from the Department of Informatics and Telecommunications of The National and Kapodistrian University of Athens. Currently, his main interests are system’s security, parallel systems, artificial intelligence, operating systems, system programming, telecommunications, web applications, human – machine interaction and mobile development.

How to get the standard input in Java

In this tutorial we are going to see how to use the standard input in Java. As you can imagine this is probably one of the most basic things you have to learn when you start up with programming, because it really is fundamental to read user input and process it as you want.

Basically, all you have to do to get the standard input in Java is:

  • Create an InputStreamReader to System.in
  • Create a BufferedReader to the above InputStreamReader
  • Use the BufferedReader.readLine() method to read the input line by line.

 

Let’s take a look a the simple code snippet that follows:

package com.javacodegeeks.java.core;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class JavaStandardInput {

	public static void main(String args[]) {

		try {

			InputStreamReader in= new InputStreamReader(System.in);

			BufferedReader input = new BufferedReader(in);

			String str;

     			System.out.print("Write something here and press Enter:");

			while ((str = input.readLine()) != null) {
				System.out.println(str);
			}

		} catch (IOException io) {
			io.printStackTrace();
		}
	}
}

Output:

Write something here and press Enter:Java Code Geeks Rock !
Java Code Geeks Rock !

 
This was an example on how to get the standard input in Java.

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