What does “abstract” means?

That this Class cannot have objects and can also have abstract methods that are empty and must be overridden in the subclasses to make them operational.

What does “final” means?

Using this modifier implies that nothing can modify or override the defined object/class/variable.

Method overloading

It’s having different methods with the same name but with different inputs parameters. And when you call them it will run the method that matches with the input parameters given.

What does “instaceOf” means?

It’s and operator that returns true if and the given object is an instance of the given class.

MyClass myObject = new MyClass(); 
if(myObject instaceOf MyClass){}

What does “this” means?

It’s a word used to determine that the taken action is made to the currently using object (an instance of a class) and not to the whole class.

What does “public” means?

Is a modifier and they regulate from where you can access to that part of code.

	Public	Protected	Private
Class	Yes	Yes	Yes
SubClass	Yes	Yes	No
Package	Yes	Yes	No
World	Yes	No	No