What is sub class in Java?

Answer 1

A sub class is paired up with its super class. These can also be called a child and parent class.

The subclass will inherit all of the variables and methods from its superclass. And one superclass can have multiple subclasses, but a subclass can only have one superclass.

Here's an example:

public class childName extends parentName {

...

}

This means that childName will inherit everything from its superclass, which is parentName.

The advantage of this inheritance is that you do not need to copy/paste lots of code for many similar subclasses, and if you want to change something you only need to make one change in the superclass.

Answer 2

The superclass is the class from which the current class inherits.
The subclass is the class which inherits from the current class.

class ArrayList extends AbstractList {}

Here AbstractList is the superclass of ArrayList and ArrayList is the subclass of AbstractList.

Answer 3

A subclass in Java is a class that inherits features from a parent class.

class Car {

public void goForADrive() {

System.out.println("driving a car");

}

// more code

}

class Ferrari extends Car {

public void takeFerrariForADrive() {

System.out.println("driving a Ferrari");

}

// more code

}

In the above example Ferrari is the subclass and Car is the super class