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what is dynamic method dispatch ?
 Question Submitted By :: Core-Java
I also faced this Question!!     Answer Posted By  
# 1
Dynamic dispatch is a mechanism by which a call to
Overridden function is resolved at runtime rather than at
Compile time , and this is how Java implements Run time
Is This Answer Correct ?    78 Yes 5 No
# 2
class A
public void m1()
class B extends A
public void m1()
A a=new B();//B reference will be assign at run time
a.m1();//class B method m1() will be called at runtime
Is This Answer Correct ?    73 Yes 17 No
Yayati Pavan Kumar
# 3
Dynamic Method Dispatch is Run -time Polymorphism which is
Method Overriding.
Is This Answer Correct ?    68 Yes 14 No
# 4
super class reference variable refering to a subclass object
is called dynamic method dispatch.
Is This Answer Correct ?    33 Yes 8 No
# 5
Java uses this fact to resolve calls to overridden methods
at run time. Here’s
how. When an overridden method is called through a
superclass reference, Java determines
which version of that method to execute based upon the type
of the object being referred to at the
time the call occurs. Thus, this determination is made at
run time with the help of dynamic method dispatch .
Is This Answer Correct ?    29 Yes 4 No
# 6
This is a unique feature in the name itself
suggests that it is related with run time.In this classes
has methods with same method name and signature.However
which method will b executed will be decided during run
Is This Answer Correct ?    29 Yes 12 No
# 7
In dynamic method dispatch a reference of class can be
created and that can be used to executed overridden method
at run time.
Is This Answer Correct ?    20 Yes 5 No
Shanti Bhushan Singh
# 8
Dynamic method dispatch is the process the Java runtime
system uses to determine which method implementation to call
in an inheritance hierarchy. For example, the Object class
has a toString() method that all subclasses inherit, but the
String class overrides this method to return its string
content. If a String or other object type is assigned to an
Object reference using application logic, the Java compiler
cannot know in advance where a call to the toString() method
will be resolved, it must be determined dynamically at runtime.
Is This Answer Correct ?    7 Yes 3 No
# 9
Dispatching call to a method at runtime by jvm.In dinamic
dispatch method invocation jvm identifies which should be
Is This Answer Correct ?    8 Yes 5 No
# 10
class A{
void hallo(){
System.out.println(" hallo of A");
class B extends A {
void hallo(){ // method overridden.
System.out.println("hallo of B");
class C extends B {
void hallo(){ // method overridden
System.out.println("hallo of C");
class Demo {
public static void main(String[] args) {
A a = new A(); // create object of A
B b = new B(); // create object of B
C c = new C(); // create object of C
A r; // create a reference of super class
r=a; // assign object of A to the reference var. r
r.hallo(); // it calls hallo() of class A
r=b; // super class variable can reference a
sub class object.
r.hallo(); // it calls hallo() of class B
r =c; // super class variable can ref. sub
class object.
r.hallo(); // it calls hallo() of class C

this is how dynamic dispath method works.
overridden methods are resolved at run time rather than
compile time. At compile time it doesn't know which over-
ridden method will be called.
it comes to know at run time, thats why it is called as run
time polymorphism.
Is This Answer Correct ?    5 Yes 3 No
J Mathew

Other Core Java Interview Questions
  Question Asked @ Answers
what is connection pooling with example? AMDOC 3
Why does java doesnot support multiple inheritance? TCS 4
Class A extends Class B but Class A also inherit Super Class Object so it is multiple inheritence give reason in support of your answer   3
What is the difference between Access Modifier and Access specifier?   1
what is the difference between static block and static method Huawei 19
heavy components means what?   4
what is the use of reference variable   6
What is an enumeration class?   2
Can we have a abstract class withought any method? What is a purspose of this?   3
What classes of exceptions, caught by a catch clause?   1
What is meant by event handling?   2
Which One is optimal to choose ? Syncronized hash map or Hash table with single thread model? How can a hash map syncronized with out using syncrozed blocks in programm? Four-soft 3
For more Core Java Interview Questions Click Here 

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