[Java] Input by BufferedReader

 Input by BufferedReader

1. Reading data from keyboard

- There are many ways to read data from keyboard

1) InputStreamReader

2) Console

3) Scanner

4) DataInputStream etc..

2. InputStreamReader class

- InputStreamReader class can be used to read data from keyboard. It performs two tasks

1) connects to input stream of keyboard

2) converts the byte-oriented stream into character-oriented stream

3. BufferedReader class

- BufferedReader class can be used to read data by line by readLine() method

4. Example

1) Simple

public class FourOperation { public static void main(String[]args) throws IOException{ InputStreamReader r = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(r); System.out.println("Enter your name"); String name = br.readLine(); System.out.println("Welcome" + name); } }

2) User can stop the program

package output; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; public class FourOperation { public static void main(String[]args) throws IOException{ InputStreamReader r = new InputStreamReader(System.in); BufferedReader br = new BufferedReader(r); String name=""; while(!name.equals("stop")){ System.out.println("Enter your name"); name = br.readLine(); System.out.println("Welcome" + name); } br.close(); r.close(); } }