General Questions

Question 16 :

Which two cause a compiler error?
1. float[ ] f = new float(3);
2. float f2[ ] = new float[ ];
3. float[ ]f1 = new float[3];
4. float f3[ ] = new float[3];
5. float f5[ ] = {1.0f, 2.0f, 2.0f};


A). 2, 4
B). 3, 5
C). 4, 5
D). 1, 2
Answer : Option D

Explanation :

(1) causes two compiler errors ( '[' expected and illegal start of expression) because the wrong type of bracket is used, ( ) instead of [ ]. The following is the correct syntax: float[ ] f = new float[3];

(2) causes a compiler error ( '{' expected ) because the array constructor does not specify the number of elements in the array. The following is the correct syntax: float f2[ ] = new float[3];

(3), (4), and (5) compile without error.


Question 17 :

Given a method in a protected class, what access modifier do you use to restrict access to that method to only the other members of the same class?


A). final
B). static
C). private
D). protected
E). volatile
Answer : Option C

Explanation :

The private access modifier limits access to members of the same class.

Option A, B, D, and E are wrong because protected are the wrong access modifiers, and final, static, and volatile are modifiers but not access modifiers.


Question 18 :

Which is a valid declaration within an interface?


A). public static short stop = 23;
B). protected short stop = 23;
C). transient short stop = 23;
D). final void madness(short stop);
Answer : Option A

Explanation :

(A) is valid interface declarations.

(B) and (C) are incorrect because interface variables cannot be either protected or transient. (D) is incorrect because interface methods cannot be final or static.