MODULE 7: BASICS - CLASSES, OBJECTS, AND
METHODS – PROGRAMMING.
Trusted by students across multiple disciplines!
What is a Class? - Answer: A blueprint that defines an objects variables and methods.
What is an Object? - Answer: An object is an instance of a class. It is any entity which
has states and behaviors. Which contains an address and takes up some space in
memory.
Can objects communicate without knowing the details of each other's code? - Answer:
It is possible for them to communicate without knowing the details of one another.
How do you code an Object? - Answer: Use the name of the Class that you want the
object from.
If I had a Dog class my Dog object would be...
Dog bruno = new Dog();
What are Classes used for in Java? - Answer: They are used to create object and
define the objects data types (fields) and methods (behaviors).
Do Classes allocate memory? - Answer: They do not consume any space in memory.
What is a method? - Answer: A coordinated sequence of instructions that are carried
out when requested. Other languages outside of Java may call these functions. They
give the functionality to our Class or its Object
eat();
How are methods declared? - Answer: It is declared with access modifiers.
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, What are your access modifiers? - Answer: public - available by anything
protected - available to anything in the same package or to subclasses
(default) - only accessible in the package ( also called package private)
private - only accessible in the class itself.
What must methods always have? - Answer: a return type
What is a return type? - Answer: A return type is what the method "gives back" when
called. It can be an object, primitive, or void if the method is not expected to return
anything.
What does the void return type mean? - Answer: That the method will perform a task
and terminate.
What is a main method? - Answer: It serves as the entry point to a program. When
runtime executes a program, it always starts at the Main method.
When we have more than 1 main method per program? - Answer: In class scope, we
can have only one:
public static void main (String args[]){}
per class, since it's a static method of a class that belongs to a class and not to its
objects and is called using its class name.
Where should we place methods to a specific object? - Answer: In the class that it
pertains to.
It is best practice to do what with Classes? - Answer: To have each class in their own
file.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
METHODS – PROGRAMMING.
Trusted by students across multiple disciplines!
What is a Class? - Answer: A blueprint that defines an objects variables and methods.
What is an Object? - Answer: An object is an instance of a class. It is any entity which
has states and behaviors. Which contains an address and takes up some space in
memory.
Can objects communicate without knowing the details of each other's code? - Answer:
It is possible for them to communicate without knowing the details of one another.
How do you code an Object? - Answer: Use the name of the Class that you want the
object from.
If I had a Dog class my Dog object would be...
Dog bruno = new Dog();
What are Classes used for in Java? - Answer: They are used to create object and
define the objects data types (fields) and methods (behaviors).
Do Classes allocate memory? - Answer: They do not consume any space in memory.
What is a method? - Answer: A coordinated sequence of instructions that are carried
out when requested. Other languages outside of Java may call these functions. They
give the functionality to our Class or its Object
eat();
How are methods declared? - Answer: It is declared with access modifiers.
1
APPHIA - Crafted with Care and Precision for Academic Excellence.
, What are your access modifiers? - Answer: public - available by anything
protected - available to anything in the same package or to subclasses
(default) - only accessible in the package ( also called package private)
private - only accessible in the class itself.
What must methods always have? - Answer: a return type
What is a return type? - Answer: A return type is what the method "gives back" when
called. It can be an object, primitive, or void if the method is not expected to return
anything.
What does the void return type mean? - Answer: That the method will perform a task
and terminate.
What is a main method? - Answer: It serves as the entry point to a program. When
runtime executes a program, it always starts at the Main method.
When we have more than 1 main method per program? - Answer: In class scope, we
can have only one:
public static void main (String args[]){}
per class, since it's a static method of a class that belongs to a class and not to its
objects and is called using its class name.
Where should we place methods to a specific object? - Answer: In the class that it
pertains to.
It is best practice to do what with Classes? - Answer: To have each class in their own
file.
2
APPHIA - Crafted with Care and Precision for Academic Excellence.
