STI IT1712 Classes and Methods Quiz

10 Questions

It signifies the method does not return a value

Parameters are the list of variables in a method declaration, while arguments are the actual values passed when invoking the method

To prevent errors and ensure consistency in data handling

Variables declared outside methods, constructors, or blocks

Represents an object's name receiving the method call within a method definition

To change the data stored in one or more private instance variables

A private method cannot be invoked outside its class, while a public method can.

The process of combining data and actions into a single item

The structure of a class including name, variables, and methods

Variables hold memory addresses of objects

Study Notes

The void keyword indicates that a method does not return a value.
A parameter is a list of variables in a method declaration, while an argument is the actual value passed when the method is invoked.
The data type of the return value must match the declared return type.

Instance variables are variables declared outside a method, constructor, or block.
Local variables are variables declared within a method definition and are only visible to that method.

The this keyword represents the object's name receiving the method call within a method definition.

Information hiding is a mechanism for restricting access to some of an object's components.
Advantages of information hiding include:
- Making components easier to understand and use
- Simplifying modification and repair
- Facilitating re-use
If an instance variable is public, there are no restrictions on where its name can be used.
If an instance variable is private, its name cannot be used to access it outside of the class definition.
Accessor methods are public methods that return data from private instance variables.
Mutator methods are public methods that change the data stored in one or more private instance variables.

Encapsulation is the process of combining data and actions into a single item.
It groups instance variables and methods into a class and hides implementation details.

The UML Class Diagram describes the structure of a class by displaying the class name, variables, and methods.

A variable of a class type contains the memory address of the object named by the variable, rather than the object itself.
The address of the object's memory location is called a reference to the object.
Class types are reference types whose variables hold references or memory addresses.
Use the equals() method for comparison, instead of ==.

10 Questions