Java Exam 7 November 2014

1. Which statement(s) are true? (Choose all that apply.)

Cohesion is the OO principle most closely associated with hiding implementation details

Cohesion is the OO principle most closely associated with making sure that classes knowabout other classes only through their APIs

Cohesion is the OO principle most closely associated with making sure that a class isdesigned with a single, well-focused purpose

Cohesion is the OO principle most closely associated with allowing a single object to beseen as having many types

2. Given:

What is the result?

5 7

5 8

8 7

8 8

Compilation fails

An exception is thrown at runtime

3. Given:

What is the result? (Choose all that apply.)

Compilation succeeds

Compilation fails due to an error on line 8

Compilation fails due to an error on line 10

Compilation fails due to an error on line 12

Compilation fails due to an error on line 14

4. Given:

What is the result?

Furry bray

Stripes bray

Furry generic noise

An exception is thrown at runtime

Stripes generic noice

Compilation fails

5. Given:

What is the result?

Compilation fails

Button key lint nickelnickel lint key button

Nickel button key lintbutton key lint nickel

Nickel button key lintnickel button key lint

Nickel button key lintnickel lint key button

An exception is thrown at runtime

6. Given:

2

4

An exception is thrown at runtime

Compilation fails due to an error on line 4

Compilation fails due to an error on line 5

Compilation fails due to an error on line 6

Compilation fails due to an error on line 7

7. Given:

What is the result?

-124

-134

-424

-434

-444

Compilation fails

8. Which are true? (Choose all that apply.)

It is appropriate to use assertions to validate arguments to methods marked public

It is appropriate to catch and handle assertion errors

It is NOT appropriate to use assertions to validate command-line arguments

It is appropriate to use assertions to generate alerts when you reach code that should notbe reachable

It is NOT appropriate for assertions to change a program’s state

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9. Which are true about a static nested class? (Choose all that apply.)

You must have a reference to an instance of the enclosing class in order to instantiate it

It does not have access to non-static members of the enclosing class

Its variables and methods must be static

If the outer class is named MyOuter, and the nested class is named MyInner, it can beinstantiated using new MyOuter.MyInner();

It must extend the enclosing class

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10. Given:

Which could be used to create an appropriate catch block? (Choose all that apply.)

ClassCastException

IllegalStateException

ExceptionInInitializerError

ArrayIndexOutOfBoundsException

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