APCSA Practice test mine

Front

Which of the following best describes why an error occurs when the classes are compiled?
The class Alpha does not have a defined constructor.
The class Alpha must be declared as a subclass of Beta.
The class Beta must be declared as a subclass of Alpha.
The answer method cannot be accessed from a class other than Alpha.
The result of the method call item.answer() cannot be assigned to a variable of type double.

Back

The answer method cannot be accessed from a class other than Alpha.

Front

Which of the following can be used to replace the body of calculate so that the modified version of calculate will return the same result as the original version for all x ? Options: return 3 + x; return 3 * x; return 4 * x; return 6 * x; return 8 * x;

Back

return 8 * x;

Front

Back

return 8 * x;

Front

Which of the following could be used to replace /* missing constructor call */ so that the method will compile without error? Options: Sample(), Sample(int x = 10, double y = 6.2), Sample(int x, double y), Sample(10, 6.2), Sample(6.2, 10)

Back

Sample(10, 6.2)

Front

The following statement assigns an integer value to x.
int x = (int)(Math.random() * 5) + 10;
Consider the statement that would result if the positions of 5 and 10 were swapped in the preceding statement and the resulting integer were assigned to y.
int y = (int)(Math.random() * 10) + 5;
Which of the following are true statements about how the possible values assigned to y differ from the possible values assigned to x ?
I.
There are more possible values of x than there are possible values of y.
II.
There are more possible values of y than there are possible values of x.
III.
The value assigned to x can sometimes be the same as the value assigned to y.
I and III
II and III

Back

II and III

Front

Assume that check occurs at least once in str. Which of the following best describes the value returned by the what method?

Back

The index of the last occurrence of check inside str

Front

Which of the following declarations will compile without error? Options: I. Student a = new Student(); II. Student b = new Student("Juan", 15); III. Student c = new Student("Juan", "15"); I and II only I and III only

Back

I and II only

Front

Consider the method, between, which is intended to return true if x is between lower and upper, inclusive, and false otherwise. Which of the following can be used to replace /* missing code */ so that between will work as intended? Options: return (x <= lower) && (x >= upper);, return (x <= lower) || (x >= upper);, return lower <= x <= upper;, return (x >= lower) && (x <= upper);, return (x >= lower) || (x <= upper);

Back

return (x >= lower) && (x <= upper);

Front

Assume that a, b, and c are boolean variables that have been properly declared and initialized. Which boolean expression is equivalent to !(a && b) || c?

Back

!a || !b || c

Front

!( !( a && b ) || ( c || !d ))
Which of the following is equivalent to the expression?

Back

( a && b ) && ( !c && d )