intanceof operator

[sumit kothalikar]

Obfuscated with the output of following code

  interface I{}

class A{}

class B extends A{}

class C extends B implements I{}

class Testinstance1{
public static void main(String [] args){
C []c1 =new C [2];
A a = new A();
B b = new B();
C c = new C ();
System.out.println(b instanceof A);
System.out.println(c instanceof A);
System.out.println(c1[1] instanceof Object);// line 1
}
}

  

output is
true
true
false

why the line 1 outputs false even though i am comparing array instance with Object class.

[Christophe Verré]

You didn't initialize the content of your array, so c1[1] is null. null is not an instance of anything.

[Prithvi Sehgal]

Hello,

You have not initialized the array elements explicitly to point towards any object.
When you put array this way, the Objects references are initialized with a value of
null.

By above code, you can interpret it something similar to this

   
if( null instanceof Object)

Hope this helps,

[sumit kothalikar]

if( null instanceof Object)

thanks a lot i got your point

[Prithvi Sehgal]

Dear Sumit,

From where you have copied the code snippet above? It is javaranch policy to QuoteYourSources

You are welcome.


Best Regards,

[sumit kothalikar]

Thanks a lot for your suggestion Prithvi

No i did not copied it rather i wrote it myself to check the working of instanceof operator.

[Prithvi Sehgal]

Hello Sumit,

You are welcome mate.

Best Regards,

[sumit kothalikar]

Thank's Prithvi
Ok bye.