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ReadLine in Java

How to read a line of user input in Java.

It seems that reading a line of user input is quite difficult in Java. I don’t do much Java, but I had to try it out when someone asked. Indeed, it is much more difficult than needed. I’ll stick to Python. (Update 2008-11-07: it’s not that bad in Java if you use Console.readLine)

$ javac ReadingLine.java 
$ java ReadingLine
Hello, what's your name? Tero
Hello Tero!
import java.io.*;
class ReadingLine{
	public static String readLine()
		String s = "";
		try {
			InputStreamReader converter = new InputStreamReader(System.in);
			BufferedReader in = new BufferedReader(converter);
			s = in.readLine();
		} catch (Exception e) {
			System.out.println("Error! Exception: "+e); 
		return s;
	public static void main(String[] args)
		System.out.print("Hello, what's your name? ");
		String name=readLine();
		System.out.println("Hello "+name+"!");
		System.out.println("More tutorials in http://www.iki.fi/karvinen");

It's much easier in Python

$ python helloTero.py 
Hello, what's your name? Tero
Hello Tero!
name = raw_input("Hello, what's your name? ")
print("Hello "+name+"!")
print("More tutorials in http://www.iki.fi/karvinen")

Console.readLine() version in Java

import java.io.Console;
public class helloTero {
  public static void main(String[] args) {
    Console console = System.console();
    String name = console.readLine("Hello, what's your name? ");
    System.out.println("Hello, " + name + "! Check http://www.iki.fi/karvinen");
$ javac helloTero.java 
$ java helloTero 
Hello, what's your name? Tero
Hello, Tero! Check http://www.iki.fi/karvinen

Thanks to Juhani for pointing out Console.readLine()!

Last modified: 2008-11-07. Permanent url: http://www.iki.fi/karvinen/readline_in_java.html

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