About Question enthuware.ocpjp.v7.2.1490 :

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sinapse
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About Question enthuware.ocpjp.v7.2.1490 :

Post by sinapse » Tue Sep 03, 2013 5:49 am

"You want to disable assertions for all classes of bad.* as well as good.* but at the same time want to enable them for Main.class."

With this:

java -ea:... -da:good... -da:bad... Main

You are enable assertion for the whole default package, which is different from what you were asking . ?

tn1408
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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by tn1408 » Fri Apr 04, 2014 3:32 pm

#4 is correct.
However could #1 be correct also?
Because assertion is by default disabled so we don't have to do anything to packages good and bad. All we have to do is enable assertion for main. Which is #1: java -ea Main

Thanks

Tony,

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Fri Apr 04, 2014 8:13 pm

If you just do -ea without specifying any package or class using the colon syntax, assertions will be enabled for all. That is my #1 is wrong.
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SepticInsect
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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by SepticInsect » Sat Dec 06, 2014 8:22 am

I agree with @sinapse
Shouldn't the correct answer be

Code: Select all

java -ea:Main -da:good... -da:bad... Main

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Sat Dec 06, 2014 9:23 am

SepticInsect wrote:I agree with @sinapse
Shouldn't the correct answer be

Code: Select all

java -ea:Main -da:good... -da:bad... Main
Yes, this can do the job as well. But the question doesn't ask you to disable assertions for the default package. Neither does it asks you to enable assertions for ONLY for Main.class. So the given solution works as well.

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by ewebxml » Mon Aug 10, 2015 8:53 pm

Is the * for option b) invalid syntax for assertions?

java -ea:* -da:good.* -da:bad.* Main


Please confirm.

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Mon Aug 10, 2015 9:23 pm

What happened when you tried it out?
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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by ewebxml » Tue Aug 11, 2015 2:04 am

Code: Select all

/*  
I placed this code into C:\java.
When you run this code from the command prompt using
C:\java>java -ea: AssertionTest
it will print 	
done
*/

public class AssertionTest {
 public static int y;
 public static int foo(int x) {
  System.out.print("foo");
  return y = x;
 }
 public static int bar(int z) {
  System.out.print("bar");
  return y = z;
 }

 public static void main(String[] args) {
  int t = 2;
  assert t < 4 : bar(7); 	
  assert t > 1 : foo(8); 
  System.out.print("done");
 }
}
I compiled and ran the above code from a C:\java> directory

Did it again using

C:\java>java -ea:* -da:good.* -da:bad.* AssertionTest
done
C:\java>


Oracle Docs has no mention of * "Asterisk" in notation.
Is this to throw the test taker off or is it actually used somewhere?

Please clarify.

http://docs.oracle.com/cd/E19683-01/806 ... index.html

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Tue Aug 11, 2015 8:39 am

-ea:* is not valid usage. Yes, -ea:* doesn't generate any error but it doesn't enable assertions for Main either. That is why this is an incorrect option.

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Paul.
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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by insider » Sat Aug 06, 2016 5:35 am

The explanation states that "Each enable or disable modifies the one before it."
Does it imply having some kind of order involved? It doesn't seem so.

Consider having a runnable (main) class with "assert false;" as the only line.
"-ea", "-ea:com.Test -da" and "-da -ea:com.Test" all result in AssertionError.

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Sun Aug 07, 2016 7:13 am

As per Oracle's Assertion tutorial
If a single command line contains multiple instances of these switches, they are processed in order before loading any classes. For example, the following command runs the BatTutor program with assertions enabled in package com.wombat.fruitbat but disabled in class com.wombat.fruitbat.Brickbat:

java -ea:com.wombat.fruitbat... -da:com.wombat.fruitbat.Brickbat BatTutor
So there is some kind of order.
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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by insider » Sun Aug 07, 2016 8:45 am

But that does not imply that one modifies another?

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Re: About Question enthuware.ocpjp.v7.2.1490 :

Post by admin » Sun Aug 07, 2016 11:36 am

insider wrote:But that does not imply that one modifies another?
You are right. That statement is confusing. Updated.
thank you for your feedback!
Paul.
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