SOME VERY SIMPLE AND BASIC JAVA SOURCE CODES THAT I DEVELOPED. FEEL FREE TO POINT OUT ERRORS IF ANY.(PART-2)

SOURCE CODE #6
//A SIMPLE JAVA PROGRAM THAT EXPLAINS HIERARCHIAL INHERITANCE

/* HERE InheritanceOne is the base calss, Truck, Airplane & Boat are all derived classes.

 * constructor is used in all the classes.

 * The keyword "extends" is used to show that Inheritance concept is used here.

 * Every method prints a simple line on the screen.

 * The output shows the flow of control throughtout the source code.

 * I hope this explains the concept of hierarchial inheritance very well.

 * Author - Hemapriya Gopal

 */

public class InheritanceOne

{

 float position;

 float speed;

 float fuellevel;

 public InheritanceOne()

 {

        System.out.println("Inside the constructor of the base class");

 }

 public void move()

 {

        System.out.println("Inside the InheritanceOne class move() method ");

 }

 public void addPassenger()

 {

        System.out.println("Inside the InheritanceOne class addPassenger() method ");

 }

 public void displayPosition()

 {

        System.out.println("The position of the vehicle is 45' NE ");

 }

 public void displaySpeed()

 {

        System.out.println("The vehicle is moving at the speed of 60km/hr ");

 }

 public void displayFuellevel()

 {

        System.out.println("The fuel tank in the vehicle is half-full");

 }

 public static void main(String args[])

 {

        InheritanceOne io = new InheritanceOne();

        io.move();

        io.addPassenger();

        Airplane a = new Airplane();

        a.operateUnderCarriage();

        a.displayFuellevel();

        Truck t = new Truck();

        t.getTyrePressure();

        t.displaySpeed();

        Boat b = new Boat();

        b.displayPosition();

        b.dock();

 }

/* InheritanceOne()

{

       System.out.println("Inside the destructor of the base class");

}

*/

}

class Airplane extends InheritanceOne

{

       float heightfromGround;

       public Airplane()

       {

              //super();

              System.out.println("Inside the constructor of the derived class Airplane");

       }

       public void operateUnderCarriage()

       {

              System.out.println("Inside the derived class Airplane in the method operateUndercarriage");

       }

}

class Truck extends InheritanceOne

{

       public void getTyrePressure()

       {

              System.out.println("Inside the method getTyrePressure() of the class Truck");

       }

       public Truck()

       {

              System.out.println("Inside the constructor of the derived class Truck");

       }

}

class Boat extends InheritanceOne

{

       public void dock()

       {

              System.out.println("Inside the method dock() of the derived class Boat");

       }

       public Boat()

       {

              System.out.println("Inside the constructor of the derived class Boat");

       }

}

HIERARCHIAL INHERITANCE

OUTPUT:

Inside the constructor of the base class

Inside the InheritanceOne class move() method

Inside the InheritanceOne class addPassenger() method

Inside the constructor of the base class

Inside the constructor of the derived class Airplane

Inside the derived class Airplane in the method operateUndercarriage

The fuel tank in the vehicle is half-full

Inside the constructor of the base class

Inside the constructor of the derived class Truck

Inside the method getTyrePressure() of the class Truck

The vehicle is moving at the speed of 60km/hr

Inside the constructor of the base class

Inside the constructor of the derived class Boat

The position of the vehicle is 45' NE

Inside the method dock() of the derived class Boat

SOURCE CODE #7

/*A very simple program implementing all the basic concepts of javax.swing

 * Reference - 1.The Complete Refernce 5th Edition --Herbert Schildt

 *          2.NUS - ISS S.E Notes for OOP

 *         3.http://www.wattpad.com/6660884-java-swing-gui-development-chapter-two-your-first

 * Author - Hemapriya Gopal

 */

import java.awt.*;

import javax.swing.*;

public class SwingHelloWorldForPractice

{

       public void FrameOne()

       {

              JFrame frame = new JFrame ("Hello World Application");

              frame.setSize(270,70);

              frame.setLayout(new FlowLayout());

             

              JLabel label = new JLabel ("Hello world");

              JButton button = new JButton ("OK");

              frame.add(label);

              frame.add(button);

             

              frame.setVisible(true);

       }

       public void OddOrEvenUsingGUI()

       {

              String num = JOptionPane.showInputDialog (null,"Enter a number");

              int num1=Integer.parseInt(num);

              if(num1==0)

              {

                     JOptionPane.showMessageDialog (null, "The number entered is zero");

              }

              else if(num1 %2 ==0)

              {

                     JOptionPane.showMessageDialog(null, "The number entered is an even number");

              }

              else

              {

                     JOptionPane.showMessageDialog(null, "The number entered is a odd number");

              }

       }

       public void HelloWorldGUI()

       {

              JOptionPane.showMessageDialog(null,"Hello World!", "Hello",JOptionPane.PLAIN_MESSAGE);

       }

public static void main(String args[])

{

       SwingHelloWorldForPractice shwfp = new SwingHelloWorldForPractice();

       shwfp.HelloWorldGUI();

       shwfp.OddOrEvenUsingGUI();

       shwfp.FrameOne();   

}}

OUTPUT: