About Question enthuware.ocpjp.v8.2.1342 :

[mrmuiz]

Explanation says

From Java 1.5 onwards, assert is treated as a keyword by default (as opposed to Java 1.4 version where it is treated as an identifier)

shouldn't it be

From Java 1.4 onwards, [...] (as opposed to Java 1.3 version [...]

instead?

[admin]

No, "by default" is the key part here.

[mrmuiz]

But in Java 1.4 assert is a keyword

[admin]

It is. But it is not treated as a keyword "by default".

[admin]

As per : https://docs.oracle.com/javase/8/docs/t ... ssert.html

Unless you specifically request source mode 1.4 with the -source 1.4 flag, the compiler operates in source mode 1.3. If you forget to use this flag, programs that use the new assert statement will not compile. Having the compiler use the old semantics as its default behavior (that is, allowing assert to be used as an identifier) was done for maximal source compatibility. Source mode 1.3 is likely to be phased out over time.

[mrmuiz]

I was missing this point, tanks for clarifications!

[sahoo007tm]

The question says

"You have just written a Java class named AssertTest.java that uses the assertion facility."

It does not mention anywhere that the code contains "assert" as an identifier in it.

[admin]

I am not sure I understand your point.
Paul

[sahoo007tm]

When I read this question I think possible content of AssertTest.java as following.

Do we need to provide the -source option while compiling below class to be able to use the assert?

public class AssertTest{

public static void main(String[] args){
int i=1;
assert i==1: "blah..";
}

}

[admin]

No, you don't need source option for java 1.4 and above. You should try it out.

[badbishop]

Shouldn't the list of correct answers be updated or generalized? The correct answers end up at 1.6 currently.

Code: Select all

:~$ javac -source 1.8 asserttest/AssertTest.java 
:~$ java -ea -cp /Users/tom asserttest.AssertTest 
Exception in thread "main" java.lang.AssertionError
	at asserttest.AssertTest.main(AssertTest.java:6)

[admin]

Yes, added. Although as noted in the explanation -source switch is not needed.
thank you for your feedback!
Paul.