Static Binding And Dynamic Binding

Association of method call to the method body is known as binding. There are two types of binding: Static Binding that happens at compile time and Dynamic Binding that happens at runtime.

What is reference and object

class Human{
....
}
class Boy extends Human{
   public static void main( String args[]) {
       /*This statement simply creates an object of class
        *Boy and assigns a reference of Boy to it*/  
       Boy obj1 = new Boy();

       /* Since Boy extends Human class. The object creation
        * can be done in this way.
        * Boy and assigns a reference of its parent class
        */
       Human obj2 = new Boy();
   }
}

Static Binding (called Early Binding)

The binding which can be resolved at compile time by compiler is known as static or early binding. The binding of static, private and final methods is compile-time. Why? The reason is that the these method cannot be overridden and the type of the class is determined at the compile time. Lets see an example to understand this:

Static binding example

Here we have two classes Human and Boy. Both the classes have same method walk() but the method is static, which means it cannot be overriden so even though I have used the object of Boy class while creating object obj, the parent class method is called by it. Because the reference is of Human type (parent class). So whenever a binding of static, private and final methods happen, type of the class is determined by the compiler at compile time and the binding happens then and there

class Human{
   public static void walk()
   {
       System.out.println("Human walks");
   }
}
class Boy extends Human{
   public static void walk(){
       System.out.println("Boy walks");
   }
   public static void main( String args[]) {
       /* Reference is of Human type and object is
        * Boy type
        */
       Human obj = new Boy();
       /* Reference is of HUman type and object is
        * of Human type.
        */
       Human obj2 = new Human();
       obj.walk();
       obj2.walk();
   }
}

Output

Human walks
Human walks

Dynamic Binding (called Late Binding)

When compiler is not able to resolve the call/binding at compile time, such binding is known as Dynamic or late Binding. Method Overriding is a perfect example of dynamic binding as in overriding both parent and child classes have same method and in this case the type of the object determines which method is to be executed. The type of object is determined at the run time so this is known as dynamic binding.

Dynamic binding example

This is the same example that we have seen above. The only difference here is that in this example, overriding is actually happening since these methods are not static, private and final. In case of overriding the call to the overriden method is determined at runtime by the type of object thus late binding happens. Lets see an example to understand this:

class Human{
   //Overridden Method
   public void walk()
   {
       System.out.println("Human walks");
   }
}
class Demo extends Human{
   //Overriding Method
   public void walk(){
       System.out.println("Boy walks");
   }
   public static void main( String args[]) {
       /* Reference is of Human type and object is
        * Boy type
        */
       Human obj = new Demo();
       /* Reference is of HUman type and object is
        * of Human type.
        */
       Human obj2 = new Human();
       obj.walk();
       obj2.walk();
   }
}

Output

Boy walks
Human walks

As you can see that the output is different than what we saw in the static binding example, because in this case while creation of object obj the type of the object is determined as a Boy type so method of Boy class is called. Remember the type of the object is determined at the runtime.

Via beginnersbook.com

Dam Truong