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
Pass by value Vs Pass by reference
Pass by value: Passing a copy of the value, not the original reference.

Pass by reference: Passsing the address of the object, so that you can access the original object.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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