System.out.println("Enter Username : ");
    String unm=System.console().readLine();

    System.out.println("Enter Password: ");
    char[] pwd=System.console().readPassword();

    System.out.println("Welcome : "+""+" Your password is "+ new String(pwd));

try {
    System.out.print("Enter Username: ");
    InputStreamReader streamReader = new InputStreamReader(System.in);
    BufferedReader bufferedReader = new BufferedReader(streamReader);
    String username = bufferedReader.readLine();
} catch (IOException e) {
    e.printStackTrace();
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ReadConsoleSystem {
  public static void main(String[] args) {

    System.out.println("Enter something here : ");

    try{
        BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in));
        String s = bufferRead.readLine();

        System.out.println(s);
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }

  }
}

import java.util.Scanner;

public class ReadConsoleScanner {
  public static void main(String[] args) {

      System.out.println("Enter something here : ");

       String sWhatever;

       Scanner scanIn = new Scanner(System.in);
       sWhatever = scanIn.nextLine();

       scanIn.close();
       System.out.println(sWhatever);
  }
}

String unm=System.console().readLine();

String userName;
    char[] password;
    Scanner scanner = null;
    Console console = System.console();
    if(console == null){
        scanner = new Scanner(System.in);
        System.out.println("Enter username: ");
        userName = scanner.next();
        //Read Password as well
    }else{
        System.out.println("Enter username: ");
        userName = console.readLine();
        //Read password as well
    }