assertion related(mock)

[Arjun Srivastava]

 public class Main {
 public static void main(String[] args) {
 boolean i = false;  // line1
 assert (i=true)  // line2 here i becomes true (i has to be true ,othervise it will be an assertion error)
 :
 i=false;   // line3 i return as false
 if(i) {
 System.out.println("assert is on");} //line4
 } 
 }

assume assertion is on
output: assert is on
if at line 3(the expression on assert statement) i is returned as false,then why line4 get printed?
why line 2 matters here(which makes i true) regardless of line3(which returns false)?

[Ankit Garg]

Arjun please tell the source of the question.

I don't really understand the question. Line 2 makes the value of i as true, so there will be no assertion error and line 3 will not be executed. This is why line 4 is executed...

[Arjun Srivastava]

Ankit Garg wrote:Arjun please tell the source of the question
.

i got this question from one of the page on facebook(whiz-lab).

I don't really understand the question. Line 2 makes the value of i as true, so there will be no assertion error and line 3 will not be executed. This is why line 4 is executed..

that means if line 2 is true then ,line 3 will not be exceuted
and if line 2 is false offcourse assertionerror will be thrown.
then what is the use of using line 3 for returning any value in assertion(assumption)

[Ankit Garg]

hen what is the use of using line 3 for returning any value in assertion

If you know about assertions, you should know the use of line 3. Look at any assertion tutorial like this...

[Trivikram Kamat]

The assertion statement has two forms.

The simple form is:

assert Expression1;

which is equivalent to:

if (<assertions enabled> && !Expression1)
    throw new AssertionError();

The augmented form is:

assert Expression1 : Expression2;

which is equivalent to:

if (<assertions enabled> && !Expression1)
    throw new AssertionError(Expression2);

So, you can see that in augmented form if Expression1 is true, Expression2 is never called.
That is why, statement on Line 3 (which is part of Line 2 actually) is not called - if assertions are enabled in the code given in the question.

[Arjun Srivastava]

thanks ankit and trivikram for reply,i got your concept

[Trivikram Kamat]

Anytime
Good Luck for your SCJP Exam...