Abstract classes an methods
Abstract classes do pretty much what classes do but with a bit of restriction. Example 1 (abstract classes) Take the following code: An abstract class Car.java StartingPoint.java The above code…
Final
Whenever we add 'final' in front of a variable, it means we can't change the variable under any circumstances. In this example we use an int variable number, but we…
Static variables can be called without object creation
This is how the math functions and constants work. Outputs: Constructor for Emma Smith, members in the club: 1 Constructor for Larry Oldman, members in the club: 2 Constructor for…
Static
We use the static keyword when we want all the objects to share a single variable. In this program we make 3 new objects that all share the static int…
Public, private & this
Controlling different variables in different classes. In the below class, the declaration of; private int hour; private int minute; private int second; As private, only the methods within the cat.class…
Time class creating normal time (12 hour clock)
Outputs: 14:15:20 2:15:20 pm
Using the time class (24hr clock)
Outputs: 00:00:00 14:15:20
Multiple methods and instances
The above program uses methods from the cat class, so we create a new object of that class so we can use the methods within the cat class. We pass…
Passing parameters to methods in another class
So the above program creates a new scanner, then takes the input from the scanner and puts it in a string called 'name'. This string is then executed in the…