AP CSA: inheritance in Java | 现代数学启蒙

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Topic: Inheritance in Java

Inheritance is a fundamental concept in object-oriented programming (OOP) languages like Java. It allows a class to inherit properties and behaviors from another class, known as the superclass or parent class. This enables code reuse and promotes the concept of code organization and hierarchy.

Example

Let's consider a simple example to illustrate inheritance in Java. Suppose we have a superclass called Vehicle, which has properties like color, brand, and methods like startEngine() and stopEngine(). Now, let's say we want to create a subclass called Car that inherits these properties and methods from the Vehicle class.

In this example, the Car class inherits the color and brand properties, as well as the startEngine() and stopEngine() methods from the Vehicle class. This allows us to create instances of the Car class and access these inherited properties and methods.

Exercise

Now, let's try an exercise to reinforce our understanding of inheritance in Java.

Create a superclass called Animal with properties like name and age, and methods like eat() and sleep().

Create a subclass called Cat that inherits the properties and methods from the Animal class.

Add additional properties and methods specific to the Cat class, such as meow() and play().

Create an instance of the Cat class and test out the inherited and subclass-specific properties and methods.

Resources

Here are some additional resources to learn more about inheritance in Java:

Oracle Java Tutorial on Inheritance

GeeksforGeeks article on Inheritance in Java