Question

QUESTION 1

1. Each class must be declared in its own .java file

   True or False?

QUESTION 2

1. The keyword this must always be explicitly used when referring to an object's instance variables and methods from within one of its non-static methods.

   True or False?

QUESTION 3

1. When used in a class' main method the this keyword references the object representing the class itself.

   True or False?

QUESTION 4

1. Accessor methods that test whether a condition is true or false are often called predicate methods.

   True or False?

QUESTION 5

1. A class that holds references to objects of other classes as members demonstrates composition (a has-a relationship).

   True or False?

QUESTION 6

1. The following code creates a new instance of the Pixel enum and assigns it to myPixel:

   enum Pixel {RED, GREEN, BLUE}

   // ...

   Pixel myPixel = new Pixel();

   True or False?

QUESTION 7

What does the following code display?

enum Pixel {RED, GREEN, BLUE}

// ...

public static void main(String args[]) {

for (Pixel px : Pixel.values()) {

System.out.print(px);

}

}

QUESTION 8

1. A program might be terminated before the JVM's garbage collector has been executed.

   True or False?

QUESTION 9

1. The following import statement allows the class that contains it to access all static members of the java.lang.Math class by their unqualified names (e.g.: double piVal = PI;)

   import static java.lang.Math.*;

   True or False?

QUESTION 10

1. Variables with constant values (those that cannot be modified once initialized) are declared with the keyword ______.

Answer 1

1. False.

Each "public" class needs to be declared in its own file

2. True. This is the best way to do the code

3. False

main method is static, we cannot use this in that method

4. True

5. True

6. False

7.

Red

Green

Blue

8. True.

It can terminate explicitly

9. False we still need to use Math.PI

10. final