Free Sun Certified Java Programmer MCQ Questions and Answers

Question 1

Which of the following initialization strategies for the array "dayhigh" with seven values is correct?

Accepted Answer

int dayhigh[] = { 24, 23, 24, 25, 25, 23, 21 };

Answer

int dayhigh [] = new int[24, 23, 24, 25, 25, 23, 21];

Answer

int dayhigh = { 24, 23, 24, 25, 25, 23, 21 };

Question 2

Which of the following claims regarding garbage collection in Java is accurate?

Accepted Answer

All of the above

Answer

The finalize method is always called before an object is garbage collected.

Answer

Any class that includes a finalize method should invoke its superclass' finalize method.

Answer

The garbage collector can be invoked explicitly using a Runtime object.

Question 3

Which procedures are necessary to implement the Runnable interface.

Accepted Answer

run()

Answer

stop()

Answer

wait()

Answer

update()

Question 4

What causes a thread's execution to halt?

Accepted Answer

All of the above

Answer

The thread's wait() method was invoked.

Answer

The thread invoked its yield() method.

Answer

A thread with higher priority began execution.

Question 5

Which of the following methods can modify a String object, s?

Accepted Answer

none of the above will change s

Answer

concat( s )

Answer

equals( s )

Answer

substring( s )

Question 6

Which subclass(es) of Component in the following list cannot be instantiated directly:

Accepted Answer

Container

Answer

Frame

Answer

Panel

Answer

Dialog

Question 7

If a variable-width font is used to create the string text for a column, the column's starting size is:

Accepted Answer

determined by the number of characters in the string, multiplied by the average width of a character in this font

Answer

undetermined

Answer

determined by the number of characters in the string, multiplied by the width of a character in this font

Answer

exclusively determined by the number of characters in the string