Scanner Class in Java

When I started learning Java around 8 years ago, I had a  problem. Because I'd already known C and C++, it was very hard for me to get input from console using Java code. C and C++ need just a line to get input whereas for Java we'd required a lot. Now it's more easier using Scanner class :

Reading From Keyboard :
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!");
}
}
}

Note: Code is taken from this URL.

Reading From File:
import java.util.Scanner;
import java.io.*;
class HelpFile
{
    public static void main(String[] args) throws IOException
    {
        Scanner scanner = new Scanner(new File("test.txt"));
        while (scanner.hasNextLine())
         System.out.println(scanner.nextLine());
    }
}

Reading From Socket:

Scanner remote = new Scanner(socket.getInputStream());

PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

 //read line from keyboard
line = keyboard.nextLine();
 //send line to remote node
 out.println(line);
 //wait for a line from remote node

line = remote.nextLine();