Question

1.   What will be the value of x after the following code is executed?

int x = 10, y = 20;
while (y < 100)
{
x += y;
}

A.   90
B.   110
C.   210
D.   This is an infinite loop

2.   If a superclass has constructor(s):
A.   then its subclass must initialize the superclass fields (attributes).
B.   then its subclass must call one of the constructors that the superclass does have.
C.   then its subclass does not inherit public fields (attributes) from the superclass.
D.   then its subclass must contain the default constructor for the superclass.

3.   Which of the following is a correct method header for receiving a two-dimensional array as an argument?
A.   public static void passArray(int[1,2] a)
B.   public static void passArray(int [][] a)
C.   public static void passArray(int[1],[2])
D.   public static void passArray(int[] a, int[] b)

4.   What will be returned from the following method?

public static float[] getValue(int x)

A.   A float type value
B.   An address of an array object with float type values
C.   An int type value
D.   An array of int type values

5.   Assume the class Rectangle has been created, and the following statement correctly creates an object of the class:

Rectangle rectangle = new Rectangle();
System.out.println(rectangle);

What is true about the following statement?

A.   The method will display unreadable binary data on the screen.
B.   A compiler error will occur.
C.   The rectangle object’s toString method will be implicitly called.
D.   A runtime error will occur.

Answer 1

1.   

D.   This is an infinite loop

Y is not incremented inside the loop .

2.
A.   then its subclass must initialize the superclass fields (attributes).
super() is the call to superclass constructor.

3.   
B.   public static void passArray(int [][] a)
[][] denotes two dimensional array

4.   

B.   An address of an array object with float type values
float[] is any array of float data type

5.   

C.   The rectangle object’s toString method will be implicitly called.

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