Java classes

What is the difference between a class and an object?

• A class is a blueprint to make an object
• An object is a blueprint to make a class
• A blueprint is an object to make a class
• Blueprint class is an object make a

What is a setter?

• It is used to find the value of a member variable
  
• It is used to initialise a member variable only
• It is a method used to set or change a member variable.
• It is used to change a method.

What happens if you don't put a constructor in a class definition?

• The class creates its own with arguments for every variable.
• The class creates its own with arguments for every method.
• The class creates its own without any arguments
  
• You get an error message

Which of the following is TRUE?

• In java, an instance field declared public generates a compilation error.

• int is the name of a class available in the package java.lang

• Instance variable names may only contain letters and digits.

• A class has always a constructor (possibly automatically supplied by the java compiler).

• The more comments in a program, the faster the program runs.

A constructor

• (a) Must have the same name as the class it is declared within.

• (b) Is used to create objects.

• (c) May be declared private

• (d) Both (A) and (B) above

• (e) (a), (b) and (c) above.

An overloaded method consists of............................

• (a) The same method name with different types of parameters

• (b) The same method name with different number of parameters

• (c) The same method name and same number and type of parameters with different return type

• (d) Both (a) and (b) above

• (e) (a), (b) and (c) above.

The combining of data and behavior into a single software package is called _________.

• Information Hiding
• Instantiation
• Declaration
• Encapsulation

A _________ is declared in order to have temporary working storage for data in a method.

• Local Variable
• Formal Parameter
• Actual Parameter
• Instance Variable

An object has _________, which is another way of saying that at any particular moment its instance variables have particular values.

• Identity
• State

Which of the following is NOT a vaild visibility  modifier?

• Public
• Protected
• Preserved
• Private