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Assertions

Q1: Which of the following statements is true?

A If assertions are compiled into a source file, and if no flags are included at runtime, assertions will execute by default.

B As of Java version 1.4, assertion statements are compiled by default.

C With the proper use of runtime arguments, it is possible to instruct the VM to disable assertions for a certain class, and to enable assertions for a certain package, at the same time.

D When evaluating command-line arguments, the VM gives -ea flags precedence over -da flags.

ANS:C - With the proper use of runtime arguments, it is possible to instruct the VM to disable assertions for a certain class, and to enable assertions for a certain package, at the same time.

Option C is true because multiple VM flags can be used on a single invocation of a Java program. Option A is incorrect because at runtime assertions are ignored by default. Option B is incorrect because as of Java 1.4 you must add the argument -source 1.4 to the command line if you want the compiler to compile assertion statements. Option D is incorrect because the VM evaluates all assertion flags left to right.



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