Two classes in Java program

Using two classes in Java program

class Computer 

{

  Computer() 

{

    System.out.println("Constructor of Computer class.");

  }

  void computer_method() 

{

    System.out.println("Power gone! Shut down your PC soon...");

  }

  public static void main(String[] args) 

{

    Computer my = new Computer();

    Laptop your = new Laptop();

    my.computer_method();

    your.laptop_method();

  }

}

class Laptop 

{

  Laptop() 

{

    System.out.println("Constructor of Laptop class.");

  }

  void laptop_method() 

{

    System.out.println("99% Battery available.");

  }

}