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Advanced Java online training

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Date added: 27 September 2019
Slides: 9
Provided by: dhekitha
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Title: Advanced Java online training


1
Class and Object in Java
  • https//www.gangboard.com/app-programming-scriptin
    g-training/core-java-training

2
Class
  • A class is a user defined blueprint or prototype
    from which objects are created.  
  • It represents the set of properties or methods
    that are common to all objects of one type. In
    general, class declarations can include these
    components.

3
Class
  • Modifiers  A class can be public or has default
    access.
  • Class name The name should begin with a initial
    letter (capitalized by convention).
  • Superclass(if any) The name of the classs
    parent (superclass), if any, preceded by the
    keyword extends.
  • Interfaces(if any) A comma-separated list of
    interfaces implemented by the class, if any,
    preceded by the keyword implements.
  • Body The class body surrounded by braces, .

4
Create a Class
  • Create a Class called MyClass and a Variable x
  • public class MyClass   int x  5

5
Object
  • It is a basic unit of Object Oriented
    Programming and represents the real life
    entities.  
  • A typical Java program creates many objects,
    which as you know, interact by invoking methods.

6
Object
  • State  It is represented by attributes of an
    object. It also reflects the properties of an
    object.
  • Behavior  It is represented by methods of an
    object. It also reflects the response of an
    object with other objects.
  • Identity  It gives a unique name to an object
    and enables one object to interact with other
    objects.

7
Create an Object
  • Create an Object called MyObj and print the
    value x
  • public class MyClass   int x  5 public static 
    void main(String args)     MyClass myObj  new
     MyClass()     System.out.println(myObj.x)  

8
Class and Object Difference
  • A class is a blueprint or prototype that defines
    the variables and the methods (functions) common
    to all objects of a certain kind.
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