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    Java Week - 8 Pratical

    Uploaded by

    Sheshgiri Sheshu
    The document discusses inheritance in Java by providing an example of a PhysicsTeacher class that inherits from a Teacher base class, allowing it to access the fields and methods of the Teacher class like designation, collegeName, and does() without redefining them. It also discusses single inheritance using two classes A and B, and multilevel inheritance using classes Car, Maruti, and Maruti800 to demonstrate inheritance between multiple class levels.

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    Java Week - 8 Pratical

    Uploaded by

    Sheshgiri Sheshu
    15 views3 pages
    The document discusses inheritance in Java by providing an example of a PhysicsTeacher class that inherits from a Teacher base class, allowing it to access the fields and methods of the Teacher class like designation, collegeName, and does() without redefining them. It also discusses single inheritance using two classes A and B, and multilevel inheritance using classes Car, Maruti, and Maruti800 to demonstrate inheritance between multiple class levels.

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    java week - 8 pratical

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    The document discusses inheritance in Java by providing an example of a PhysicsTeacher class that inherits from a Teacher base class, allowing it to access the fields and methods of the Teacher class like designation, collegeName, and does() without redefining them. It also discusses single inheritance using two classes A and B, and multilevel inheritance using classes Car, Maruti, and Maruti800 to demonstrate inheritance between multiple class levels.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    15 views3 pages

    Java Week - 8 Pratical

    Uploaded by

    Sheshgiri Sheshu
    The document discusses inheritance in Java by providing an example of a PhysicsTeacher class that inherits from a Teacher base class, allowing it to access the fields and methods of the Teacher class like designation, collegeName, and does() without redefining them. It also discusses single inheritance using two classes A and B, and multilevel inheritance using classes Car, Maruti, and Maruti800 to demonstrate inheritance between multiple class levels.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 3

    Week – 8

    class Teacher {
    //fields of parent class
    String designation = "Teacher";
    String collegeName = "Beginnersbook";

    //method of parent class


    void does(){
    System.out.println("Teaching");
    }
    }

    public class PhysicsTeacher extends Teacher{


    //field of child class
    String mainSubject = "Physics";
    public static void main(String args[]){
    PhysicsTeacher obj = new PhysicsTeacher();
    //accessing the fields of parent class
    System.out.println(obj.collegeName);
    System.out.println(obj.designation);

    System.out.println(obj.mainSubject);

    //accessing the method of parent class


    obj.does();
    }
    }
    In the above program we have a base class Teacher and a sub class PhysicsTeacher. Child
    class inherits the following fields and methods from parent class:

     Properties: designation and collegeName properties
     Method: does()

    Child classes like MathTeacher, MusicTeacher and PhysicsTeacher do not need to write this


    code and can access these properties and method directly from base class.

    1) Single Inheritance
    Class A
    {
    public void methodA()
    {
    System.out.println("Base class method");
    }
    }

    Class B extends A
    {
    public void methodB()
    {
    System.out.println("Child class method");
    }
    public static void main(String args[])
    {
    B obj = new B();
    obj.methodA(); //calling super class method
    obj.methodB(); //calling local method
    }
    }

    Multilevel Inheritance
    class Car{
    public Car()
    {
    System.out.println("Class Car");
    }
    public void vehicleType()
    {
    System.out.println("Vehicle Type: Car");
    }
    }
    class Maruti extends Car{
    public Maruti()
    {
    System.out.println("Class Maruti");
    }
    public void brand()
    {
    System.out.println("Brand: Maruti");
    }
    public void speed()
    {
    System.out.println("Max: 90Kmph");
    }
    }
    public class Maruti800 extends Maruti{

    public Maruti800()
    {
    System.out.println("Maruti Model: 800");
    }
    public void speed()
    {
    System.out.println("Max: 80Kmph");
    }
    public static void main(String args[])
    {
    Maruti800 obj=new Maruti800();
    obj.vehicleType();
    obj.brand();
    obj.speed();
    }
    }
    Design a class & implement java program and check
    compliance with OCP .
    /*File name = run.java*/
    Interface shape {
    Public double calculateArea();
    }
    Class rectangle implements shape {
    Double length;
    Double width;
    Public double calculateArea() {
    Return length * width;
    }
    }
    Class circle implement shape {
    Public double radius;
    Public double calculateArea() {
    Return (22.0/7)* radius * radius;
    }
    }

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