JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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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
<< Previous Program | Next Program >>

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Knowledge Centre
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
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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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