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
When to use LinkedList or ArrayList?
Accessing elements are faster with ArrayList, because it is index based. But accessing is difficult with LinkedList. It is slow access. This is to access any element, you need to navigate through the elements one by one. But insertion and deletion is much faster with LinkedList, because if you know the node, just change the pointers before or after nodes. Insertion and deletion is slow with ArrayList, this is because, during these operations ArrayList need to adjust the indexes according to deletion or insetion if you are performing on middle indexes. Means, an ArrayList having 10 elements, if you are inserting at index 5, then you need to shift the indexes above 5 to one more.
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-- Daniel J. Boorstin

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] or you can comment on the page.

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