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How to read input from java console in java?


Description:

Below example shows how to read input from java console. You have to pass System.in object to InputStreamReader class. Create BufferedReader object by passing InputStreamReader, readLine() method can helps you to get the typed commands.


Code:
package com.java2novice.files;

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

public class ReadFromConsole {

	public static void main(String a[]){
		BufferedReader br = null;
		Reader r = new InputStreamReader(System.in);
		br = new BufferedReader(r);
		String str = null;
		try {
			do{
				System.out.println("Enter Input, exit to quit.");
				str = br.readLine();
				System.out.println(str);
			} while (!str.equalsIgnoreCase("exit"));
		} catch (IOException e) {
			e.printStackTrace();
		} finally{
			try{
				if(br != null) br.close();
			}catch(Exception ex){}
		}
	}
}

Output:
Enter Input, exit to quit.
Hello
Hello
Enter Input, exit to quit.
I am entering data through console
I am entering data through console
Enter Input, exit to quit.
exit
exit
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Knowledge Centre
Difference between super() and this()
super() is used to call super class constructor, whereas this() used to call constructors in the same class, means to call parameterized constructors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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