03 Prelim CP2

Question 1

• It is a special method that is used to CREATE and INITIALIZE an object.
• Using the “new” keyword calls a ______.
• It must have the same name with the class to which it belongs to.
• It does not have a return type.

Answer 1

CONSTRUCTOR

Question 2

• These are shared by all the objects of its class.
• ______ _____ that are not constants should be private.
• These should be accessed or changed only via accessor and mutator methods

Sample:
private static double numOfAccounts;

Answer 2

STATIC VARIABLES

Question 3

• can be invoked without using any object

-invoked by using the class name instead of the object name

Sample:
public static int getNumofAccounts() {
return numOfAccounts;
}

Answer 3

STATIC METHODS

Question 4

How to invoke a static method:

Answer 4

variableName = ClassName.staticMethod(arg);

Example:
inches = UnitConverter.convertFeetToInches(2.6);
feet = UnitConverter.convertInchesToFeet(53.7);

Question 5

When you declare a variable or a method as _____, it belongs to the class rather than to a specific instance.

This means that only one instance of a static member exists, even if you create multiple objects of the class or if you do not create any. It will be shared by all objects.

Answer 5

STATIC

Question 6

• Provides a number of standard mathematical
  methods.
• Does not require an import statement.
• All the methods in this class are static.
• it returns the absolute value of its parameter.

-You do not need to create an object of the Math class to use it. To access it, just type in Math. and the corresponding method.

Sample:
int higherNum = Math.max(7, 9);

Answer 6

MATH CLASS

Question 7

What method in Math class returns the absolute value of its parameter

Answer 7

Math.abs()

Sample:
int a = Math.abs(-10);

// output “10”

Question 8

What method in Math class returns the smallest parameter.

Answer 8

Math.min()

Sample:
int m = Math.min(10, 20);

// output “10”

Question 9

What method in Math class takes two (2) parameters and returns the first parameter raised to the power of the second parameter.

Answer 9

Math.pow()

Sample:
double p = Math.pow(2, 3);

// output “8.0” (2^3 = 8)

Question 10

What method in Math class returns a random number in the range >0 and <1

Answer 10

Math.random();

Question 11

What method in Math class returns the largest parameter.

Answer 11

Math.max()

Sample:
int m = Math.max(10, 20);

// output “20”

Question 12

What method in Math class returns the round number of the given parameter:

Answer 12

Math.round();

Sample:
Math.round(6.2); // 6
Math.round(6.8); // 7

Question 13

What method in Math class returns the highest closest number of the given parameter:

Answer 13

Math.ceil();

Sample:
Math.ceil(3.2); // 4.0
Math.ceil(3.8); // 4.0

Question 14

What method in Math class returns the lowest closest number of the given parameter:

Answer 14

Math.floor();

Sample:
Math.floor(3.2); // 3.0
Math.floor(3.8); // 3.0

Question 15

What method in Math class returns the square root of the given parameter:

Answer 15

Math.sqrt();

Sample:
Math.sqrt(4.0); // 2.0

Question 16

• _______the method name is when you give two (2) or more methods the same name within the same class.
• Methods
  with the same name must have a different number of
  parameters or have corresponding parameters with differing
  types.

Answer 16

OVERLOADING

Question 17

METHODS with the SAME NAME must have a DIFFERENT number of
PARAMETERS or have corresponding parameters with DIFFERING
types.

-True
-False

Answer 17

TRUE