mirror of
https://github.com/Brandon-Rozek/website.git
synced 2024-11-14 12:37:30 -05:00
39 lines
1.2 KiB
Markdown
39 lines
1.2 KiB
Markdown
# Lecture for April 3rd
|
|
|
|
## Inheritance
|
|
|
|
The *base class*, *super class*, or *parent class* is the initial class that we are working with. Let's say that you want to *extend* the class, or add additional functionality. The class that inherits from the parent class is called the *child class*, *subclass* or *derived class*.
|
|
|
|
## Child Class Syntax
|
|
|
|
```java
|
|
public class Truck extends Car {
|
|
// Truck Appropriate Fields
|
|
// Necessary methods for truck
|
|
}
|
|
```
|
|
|
|
This code adds all the methods from Car into the Truck class. You can then add methods that is specific to a Truck into the Truck class.
|
|
|
|
A child class has all parent fields and access to all parent methods!
|
|
|
|
## Visibility Modifiers
|
|
|
|
Recall the words `public` and `private`
|
|
|
|
The `public` modifier makes the field/method accessible by any class
|
|
|
|
The `private` modifier makes the field/method only accessible within the method itself
|
|
|
|
The protected modifier makes the field/method accessible within the same class or any subclasses.
|
|
|
|
## Overriding a Method
|
|
|
|
You can override a parent class method by declaring a method in the child class with the same...
|
|
|
|
- name
|
|
- number of paramters
|
|
- parameter types
|
|
|
|
but this method would have different behavior!
|
|
|