Demonstrates the result of the early binding. - Java Object Oriented Design

Java examples for Object Oriented Design:Inheritance

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Description

Demonstrates the result of the early binding.

Demo Code

class MyBase {//from ww  w .  j a  v a  2 s .c o m
    // An instance variable 
    public String str = "EarlyBindingSuper";

    // A static variable 
    public static int count = 100;

    public static void print() {
        System.out.println("Inside EarlyBindingSuper.print()");
    }
}

class MyClass extends MyBase{
    // An instance variable 
    public String str = "EarlyBindingSub";

    // A static variable 
    public static int count = 200;

    public static void print() {
        System.out.println("Inside EarlyBindingSub.print()");
    }
}


public class Main {
  public static void main(String[] args) {
    MyBase ebSuper = new MyBase();
    MyClass ebSub = new MyClass();

    // Will access EarlyBindingSuper.str 
    System.out.println(ebSuper.str);

    // Will access EarlyBindingSuper.count 
    System.out.println(ebSuper.count);

    // Will access EarlyBindingSuper.print() 
    ebSuper.print();

    // Will access EarlyBindingSub.str 
    System.out.println(ebSub.str);

    // Will access EarlyBindingSub.count 
    System.out.println(ebSub.count);

    // Will access EarlyBindingSub.print() 
    ebSub.print();

    // Will access EarlyBindingSuper.str 
    System.out.println(((MyBase)ebSub).str);

    // Will access EarlyBindingSuper.count 
    System.out.println(((MyBase)ebSub).count);

    // Will access EarlyBindingSuper.print() 
    ((MyBase)ebSub).print();

    // Assign the ebSub to ebSuper 
    ebSuper = ebSub; // Upcasting 

    /* Now access methods and fields using ebSuper variable, which is 
     referring to a EarlyBindingSub object 
    */

    // Will access EarlyBindingSuper.str 
    System.out.println(ebSuper.str);

    // Will access EarlyBindingSuper.count 
    System.out.println(ebSuper.count);

    // Will access EarlyBindingSuper.print() 
    ebSuper.print();
  }
}

Result


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