java.lang.System error in Console() [closed]

Answer 1

Use scanner class that is available.

Below is the example

import java.util.Scanner;

public class ScannerDemo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        //
        // Read string input for username
        //
        System.out.print("Username: ");
        String username = scanner.nextLine();

        //
        // Read string input for password
        //
        System.out.print("Password: ");
        String password = scanner.nextLine();

        //
        // Read an integer input for another challenge
        //
        System.out.print("What is 2 + 2: ");
        int result = scanner.nextInt();

        if (username.equals("admin") 
                && password.equals("secret") && result == 4) {
            System.out.println("Welcome to Java Application");
        } else {
            System.out.println("Invalid username or password, " +
                    "access denied!");
        }
    }
}

Answer 2

Use java.util.Scanner or InputStreamReader.

   Scanner sc=new Scanner(System.in);
   sc.nextLine();

or

   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
   br.readLine()

Answer 3

You don't have a Console available (it isn't available in all environments), so don't use it. Instead why not use a Scanner object? For more on this, please check out the Scanner Tutorial.