类的封装

1．　　实验目的

使用类来封装对象的属性和功能。

2．　　实验要求

（1）编写一个简单的Java应用程序，该程序中定义3个类：Tangle、Lader和Circle，分别用来刻画“三角形”、“梯形”和“圆形”，具体要求如下：

 　　Tangle类具有类型为double的三条边，以及周长、面积属性，具有计算并返回周长、面积以及三条边的功能，另外还要具有一个boolean型的属性，用来判断三个数能否构成一个三角形。

 　　Lander类具有类型为double的上底、下底、高和面积属性，具有返回面积的功能。

 　　Circle类具有类型为double的半径、周长和面积属性，具有返回周长、面积的功能。

（2）编写一个主类AreaAndLength测试上面的三个类。

（3）根据提供的程序模板，按模板要求，将代码替换为Java程序代码。-Class package

1. Purpose of the experiment

Use the class to encapsulate the object properties and functions.

2. Experimental requirements

(1) write a simple Java application, the program defined three categories: Tangle, Lader and the Circle, were used to characterize the "triangle", "ladder" and "round", the specific requirements are as follows:

　Tangle class of the three edges of type double, and the perimeter, area properties, with calculation and returns the perimeter, area and features three sides of the other also has a boolean type attribute is used to determine whether the three numbers form a triangle.

　Lander class type of the double bottom, under the bottom, height and area of property, has returned to the area function.

　Circle class of type double the radius, circumference and area of property, has returned to the perimeter, area functions.

(2) preparation of a master class AreaAndLength test the above three categories.

(3) Accordi