Console reader() method in Java with Examples

The reader() method of Console class in Java is used to retrieve the unique Reader object which is associated with the console. This reader() method is generally used by sophisticated applications. Simple applications that require only line oriented reading, normally use readLine() method instead of reader() method.

Syntax:

public Reader reader()

Parameters: This method does not accept any parameter.

Return value: This method returns Reader which is associated with the console.

Exceptions: This method does not any throw exception.

Note: System.console() returns null in an online IDE.

Below programs illustrate reader() method in Console class in IO package:

Program 1:

// Java program to illustrate
// Console reader() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();

        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }

        String str = cnsl.readLine(
            "Enter string : ");

        // Create scanner object
        scan = new Scanner(cnsl.reader());

        while (scan.hasNext()) {
            // Read
            String str = scan.next();

            // Print
            System.out.println(str);
        }
    }

Output:

Program 2:

// Java program to illustrate
// Console reader() method

import java.io.*;

public class GFG {
    public static void main(String[] args)
    {
        // Create the console object
        Console cnsl
            = System.console();

        if (cnsl == null) {
            System.out.println(
                "No console available");
            return;
        }

        String str = cnsl.readLine(
            "Enter string : ");

        // Create scanner object
        scan = new Scanner(cnsl.reader());

        while (scan.hasNext()) {
            // Read
            String str = scan.next();

            // Print
            System.out.println(str);
        }
    }

Output:

References:
https://docs.oracle.com/javase/10/docs/api/java/io/Console.html#reader()