Vidya sumanasekara

anirudh jagithyala wrote:

int/double=double;;;;double/int=double
therefore 3/2d=3/2.0=1.5(double)=1.5
d2=1.5


Hope it is clear

Oh....I got it...Thanks. the case is "2d"...

double d1=3/2; double d2=3/2d; System.out.print(d1+" "+d2)

Out put:-
1.0 1.5

Why it gives two different output...
help me....

kurt hanni wrote:You are running Parent class, you dont have a main method in your Parent class

yes .... Thanks..

Then output:-

Staticblock Parent
Staticblock Parent 2
Staticblock Child
Initblock Parent
Constructor Parent
Initblock Child
Initblock Child 2
Constructor Child A
Constructor Child

Can you explain me....

public class Parent { static { System.out.println("Staticblock Parent "); } { System.out.println("Initblock Parent "); } public Parent() { System.out.println("Constructor Parent "); } static { System.out.println("Staticblock Parent 2"); } } class Child extends Parent { static { System.out.println("Staticblock Child "); } { System.out.println("Initblock Child "); } public Child() { this("A"); System.out.println("Constructor Child "); } public Child(String a){ System.out.println("Constructor Child " + a); } public static void main(String args[]) { new Child(); } { System.out.println("Initblock Child 2"); } }


out put:-
Staticblock Parent
Staticblock Parent 2
Exception in thread "main" java.lang.NoSuchMethodError: main


Help me to understand this output....

Hi...
I am new to struts framework. So What are the best references for studying struts.....

int[] a = null , b [] = null; This is same as 1-D a[] and 2-D b[][] is n't it..

Ok..thank you all of you

Hareendra Reddy wrote:Hello Vidya sumanasekara ,
The problem here is this line
int[] a = null , b [] = null;
Now b is interpreted by compiler as 2-D array i.e b[][] ,
notice that a array if int type and b array of array of ints ..

HTH

class A{ public static void main(String args[]){ int[] a = null , b [] = null; b = a; System.out.println( b ); } }

Output
arr.java:4: incompatible types
found : int[]
required: int[][]
b = a;
^
1 error


Can any one please help me to understand the output....

Thanks...every body ....

i got it...

Hi,
can any one explain me the output?

code:-
class Parent { void eat(){ System.out.println("parent.eat"); } } class Child extends Parent{ void eat(){ System.out.println("child.eat(j)"); } public static void main(String args[]){ new Child().eat(); ((Parent)new Child()).eat(); } }
output:-
child.eat(j)
child.eat(j)

Thanks...

This happens because of the overriding...

In the supper class Animal -> void makeNoise()

In the sub class Dog-> void makeNoise()//overriden method & playDead()// this is unique for this class

Then you have assining a dog instance to the Animal reference ( in the loop)

In that case compiler check
Animal animal=new Dog();
first reference type (Animal) where there is playDead() method and runtime check the instance type. ok..
In your case there is no any method playDead() in Animal class..so compiler gives an error..

Hennry Smith wrote:class Animal { void makeNoise() {System.out.println("generic noise"); } } class Dog extends Animal { void makeNoise() {System.out.println("bark"); } void playDead() { System.out.println("roll over"); } } class CastTest2 { public static void main(String [] args) { Animal [] a = {new Animal(), new Dog(), new Animal() }; for(Animal animal : a) { animal.makeNoise(); if(animal instanceof Dog) { animal.playDead(); // try to do a Dog behavior ? } } } }

When we try to compile this code, the compiler says something like this:
cannot find symbol
The compiler is saying, "Hey, class Animal doesn't have a playDead() method".
Let's modify the if code block:
if(animal instanceof Dog) {
Dog d = (Dog) animal; // casting the ref. var.
d.playDead();
}

Please explain i am not able to understand this concept...???