StackOverflow2013

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plurals

PO
primarykey
Id
20835623
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-12-30T07:58:11.377
FavoriteCount
0
LastActivityDate
2016-07-05T07:01:52.627
LastEditDate
2016-07-05T07:01:52.627
LastEditorUserId
5013940
OwnerUserId
2642058
ParentId
20831722
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
Inheritance creates type compatibility. It allows a super class reference to refer to the object of sub class. (Reverse is not true). A super class reference, that refers to object of sub class, can only be used to access the inherited and overridden methods of sub class. The members newly defined in sub class are not accessible using reference of super class. <pre><code>class A { void f1() { //this holds address of object of B System.out.println("A f1"); } void f2() { System.out.println("A f2"); } }//A class B extends A { void f3() { //new method System.out.println("B f3"); } void f2() { //this holds address of object of B System.out.println("B f2 starts"); f3(); //this.f3() System.out.println("B f2 ends "); } } //B class TypeCmptbl { public static void main(String args[]) { A ref; //reference of A ref = new B();//Object of B //ref.inherited() allowed ref.f1(); //ref.overridden() allowed ref.f2(); //ref.newMembersOfChild() not allowed //ref.f3(); }//main } </code></pre> Consider the statement <pre><code> ref.f2(); </code></pre> Here ref is a reference of class A and it has address of object of class B f2() is a overridden method. When compiler detects such a statement then it doesn't bind the function call with any definition. It only validates the call. Binding of such calls is left for the runtime environment. At program runtime system identifies the datatype of the object and binds the function call with the function definition provided by the class of object. This type of binding between the function call and function defination is called as "late binding" or "runtime binding" or "runtime polymorphism" or "dynamic method dispatch".
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1. POWhat is runtime binding?
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1. PTAnswer
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1. USAshish
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1. POWhat is runtime binding?
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1. VO
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2. VO
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