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Understanding Class Inheritance
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public void rest(){ /* Rest */ } public void move(int direction) { /* Walk in the direction given as a parameter */ } public void meow() { /* Meow */ } } public class Horse1 { int weight; int age; String hairColor; public void eat(){ /* Eat food by chewing */ } public void rest(){ /* rest */ } public void move(int direction) { /* Walk in the direction given as a parameter */ } public void neigh() { /* Neigh */ } }
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The first implementation of these animals is to create a unique class for each one. Each of the preceding classes has no relationship to the other. It is easy to see that the classes are all very similar and there is duplicated code between them. In fact, all the methods are the same except the bark(), meow(), and neigh() methods. Although there is no explicit relationship defined in the code, it is easy to infer that all three classes are related. The same example can be better implemented by using inheritance. In this simple example, three of the four methods that need to be implemented are common to each different animal. A dog, cat, and horse all eat, rest, and move in similar fashion. This common functionality can be placed in a general Animal class. This class defines all the general methods and instance variables that make up an animal. When the developer creates more specific types of animals such as dogs, cats, or horses, they can use the Animal class as a base, or superclass. The more specific classes will inherit all of the nonprivate methods and instance variables from the base Animal class. A class is inherited when it is extended. It is important to remember that a class can only extend one class. It is invalid to inherit multiple classes. The extends keyword is used in the class signature line.
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The following is an example of the same animals being implemented using inheritance:
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public class Animal { int weight; int age; String hairColor; public void eat(){ /* Eat food by chewing */ } public void rest(){ /* Rest */ } public void move(int direction) { /* Walk in the direction given as a parameter */ } } public class Dog2 extends Animal{ public void bark() { /* Bark */ } } public class Cat2 extends Animal{ public void meow() { /* Meow */ } } public class Horse2 extends Animal{ public void neigh() { /* Neigh */ } }
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This example creates dog2, cat2, and horse2 classes that are functionally the same as the first example. Each one of these classes extends, or inherits, the Animal class. The Animal class is used as their base, or superclass. The specific classes inherit all of the methods and instance variables from the Animal class, and are then permitted to add specific methods and variables that the particular class may need. In this example, each class added a method to make the noise of the animal. The classes may add as many instance variables or methods as needed, or only use the ones provided from the superclass.
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Saying that class X extends class Y is the same as saying that class X inherits class Y.
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Understanding Class Inheritance
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When a class extends another class, any nonprivate methods that are contained in the superclass are accessible from the subclass. They can be invoked in the same manner as the methods implemented in the subclass. The following example demonstrates how the Dog2 class can be used:
Dog2 dog = new Dog2(); dog.bark(); dog.eat();
In the preceding example, a Dog2 object named dog is created. Then, the bark() and eat() methods are called. Notice that both methods can be called in the same manner, even though only the bark() method is implemented in the Dog2 class. This is because any Dog2 object inherits all of the nonprivate methods in the Animal class.
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