Programming with Java Polygon objects

Javaoop uses Java object-oriented thinking to solve business problems in the Software IDE ((Integrated Integrated Development Development Environment Environment): Eclipse and MyEclipse1. Object Encapsulation 1. What is a class and what is an object ？       Parse: Class is a class object that is new.       The class is a type object that is an instance.        A class is a generic term for a series of transactions that have the same properties and behavior. An object is a specific individual.    2. How do I create an object? The new factory floor is also created through new.   3. How do I receive the console input in my program? Scanner Software: Convenient for others to use, you can save some people's time. Object-oriented: 1. How do I close the project and keep the closed project hidden? Resolution: Open the View Menu at 1.1, then click Filters (Filter)----->closed prejects 1.2 Select a project, click Close Project, or click Close unrelated projects2. Future  Projects will be more and more, separate batches to manage, each batch I need a name? 2.1 Select Working Set click NEW3. How to create a class, be sure to let the class belong to a package ... It has to be done. 4. Do I declare a variable to be assigned a value? Can be discussed without discussion: Situation one: No, the member variable situation two: With a variable within the method, a local variable. If the local variable does not assign the initial value, is used, then will be error.

Programming with Java Polygon objects