What is a Subclass

Question

What is a  subclass  in java   I know about classes and methods  but I do not know about subclasses

User · Accepted Answer

A subclass is a class that extends another class.

public class BaseClass{
    public String getFoo(){
        return "foo";
    }
}

public class SubClass extends BaseClass{
}

Then...

System.out.println(new SubClass().getFoo());

Will print:

foo

This works because a subclass inherits the functionality of the class it extends.

User · Answer

A subclass in java  is a class that inherits from another class   Inheritance is a way for classes to add specialized behavior ontop of generalized behavior  This is often represented by the phrase  is a  relationship   For example  a Triangle is a Shape  so it might make sense to implement a Shape class  and have the Triangle class inherit from it  In this example  Shape is the superclass of Triangle and Triangle is the subclass of Shape

User · Answer

Subclass is to Class as Java is to Programming Language

User · Answer

If you have the following   public class A      public class B extends A       then B is a subclass of A  B inherits from A  The opposite would be superclass

User · Answer

Think of a class as a description of the members of a set of things  All of the members of that set have common characteristics  methods and properties    A subclass is a class that describes the members of a particular subset of the original set  They share many of characteristics of the main class  but may have properties or methods that are unique to members of the subclass   You declare that one class is subclass of another via the  extends  keyword in Java   public class B extends A           B is a subclass of A  Instances of class B will automatically exhibit many of the same properties as instances of class A   This is the main concept of inheritance in Object-Oriented programming

User · Answer

A subclass is something that extends the functionality of your existing class  I e   Superclass - describes the catagory of objects   public abstract class Fruit        public abstract Color color       Subclass1 - describes attributes of the individual Fruit objects   public class Apple extends Fruit        Color color   red       Subclass2 - describes attributes of the individual Fruit objects   public class Banana extends Fruit        Color color   yellow       The  abstract  keyword in the superclass means that the class will only define the mandatory information that each subclass must have i e  A piece of fruit must have a color so it is defines in the super class and all subclasses must  inherit  that attribute and define the value that describes the specific object   Does that make sense

User · Answer

A sub class is a small file of a program that extends from some other class   For example you make a class about cars in general and have basic information that holds true for all cars with your constructors and stuff then you have a class that extends from that on a more specific car or line of cars that would have new variables methods   I see you already have plenty of examples of code from above by the time I get to post this but I hope this description helps

User · Answer

It is a class that extends another class   example taken from https   www java-tips org java-se-tips-100019 24-java-lang 784-what-is-a-java-subclass html  Cat is a sub class of Animal  -   public class Animal        public static void hide             System out println  The hide method in Animal                public void override             System out println  The override method in Animal              public class Cat extends Animal        public static void hide             System out println  The hide method in Cat                public void override             System out println  The override method in Cat                public static void main String   args            Cat myCat   new Cat            Animal myAnimal    Animal myCat          myAnimal hide            myAnimal override

[java] What is a Subclass

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