Inheritance - Beginning Java 8 Fundamentals - page 589

Listing 16-7. An EarlyBindingSub Class, Which Inherits from EarlyBindingSuper Class and Has a Static Field,
an Instance Field, and a Static Method, Which Are of the Same Type as in Its Superclass
// EarlyBindingSub.java
package com.jdojo.inheritance;
public class EarlyBindingSub extends EarlyBindingSuper{
// 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()");
}
}
The EarlyBindingSuper class declares two fields: str and count . The str field is declared non-static and count is
declared static . The print() method is declared static .
The EarlyBindingSub class inherits from the EarlyBindingSuper class and it declares the same types of fields
and methods, which have the same names. Fields are set to different values and the method prints a different
message in the EarlyBindingSub class, so you can know which one is accessed when you execute your code. The
EarlyBindingTest class in Listing 16-8 demonstrates the result of the early binding.
Listing 16-8. A Test Class to Demonstrate Early Binding for Fields and Methods
// EarlyBindingTest.java
package com.jdojo.inheritance;
public class EarlyBindingTest {
public static void main(String[] args) {
EarlyBindingSuper ebSuper = new EarlyBindingSuper();
EarlyBindingSub ebSub = new EarlyBindingSub();
// Will access EarlyBindingSuper.str
System.out.println(ebSuper.str);
// Will access EarlyBindingSuper.count
System.out.println(ebSuper.count);
// Will access EarlyBindingSuper.print()
ebSuper.print();
System.out.println("------------------------------");
// Will access EarlyBindingSub.str
System.out.println(ebSub.str);
// Will access EarlyBindingSub.count
System.out.println(ebSub.count);