LoveKnight的博客

The School of Information and Electronic Engineering is one of biggest schools in University 。 As part of teaching administration, staffs and international students use an old system. The Dean is convinced that the current system has been outgrown, as they have been receiving increased complaints from staff and international students, and also because other Universities have released totally revamped and highly functional computer system to their schools. In the current system duplication of data entry and lack of networking are both causing great difficulty. Furthermore they recognize the need for access to the internet.

简单的无限循环ATM机的实现 使用编程习题9.7中创建的Account类来模拟一台ATM机。创建一个有10个账户的数组，其id为0，1，…9，并初始化收支为100美元 详见题目Java语言程序设计与数据结构中文版347页10.7

Triangle extends GeometricObject 设计一个名为Triangle的类来继承GeometricObject类。该类包括： 三个名为side1,side2,side3的double类型数据域来表示这个三角形的三条边，它们的默认值是1.0。 一个无参构造方法，创建一个默认的三角形。 一个创建指定side1,side2,side3值的三角形的构造方法。 所有三个数据域的访问器方法。 一个名为getArea()的方法返回该三角形的面积。 一个名为getPerimeter()的方法返回该三角形的周长。 一个名为toString()的方法返回该三角形的字符串描述。