What are the two main visual distinctions between the constructor and the class methods?

What is TRUE about defining variables and methods in the class definition? Variables must be declared before methods are defined. Methods must be defined before variables are declared. Variable declarations and method definitions can be placed in any order. All variables must be public while all methods must be private.

You need to perform following things to demonstrate the concept of abstract class. Step 1: Create the abstract class that has following methods. • Calculate the area of circle(Abstract method) • Calculate the area of triangle(Abstract method) • Calculate the area of rectangle(Method with implementation) Step 2: Create another class that extends above class and provide implementation of abstract methods. Step 3: Create the main method inside above class and display output of area of circle, area of triangle and area of rectangle. You need to submit the following things: • Java program with both the classes An output screenshot created using Microsoft Word

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The class object is added to the class object. When a state change is recognized, the method in the interface is called. The ConcreteObserver the Observer interface.