实验三类和对象编程(类和对象基础)

1、实验三 类和对象编程类和对象基础一、实验目的1.理解类与对象；2.掌握类与对象的关系；3.掌握成员变量和成员方法的特性。二、实验器材计算机硬件环境：PIII 667以上计算机；软件环境：MyEclipse6.0以上。三、实验内容设计2个类，分别本科生类Undergaduate，研究生类Postgraduate，他们都包含一些基本属性，如姓名、所学课程、课程成绩（多门成绩）、成绩等级等；他们都通过构造方法进行初始化；他们都具有一个方法getGrade（），用于通过分数的平均分计算成绩的等级，研究生的标准要比本科生的标准高一些，如下表所示。表 课程成绩等级本科生标准研究生标准80-100优秀901

2、00优秀70-80良好8090良好60-70一般7080一般50-60及格6070及格50以下不及格60以下不及格编写测试类，在测试类里创建若干个Undergaduate与Postgraduate对象，计算他们的成绩，并输出他们的个人信息。四、实验步骤学生类package .shy;public class Student private String name;private int chinese;private int math;private int english;public Student (String name,int chinese,int math,int english

3、 = name;this.chinese = chinese;this.math = math ;this.english = english;public String getName( return name;public void setName(String name = name;public int getChinese( return chinese;public void setChinese(int chinese this.chinese = chinese;public int getMath( return math;public

4、void setMath(int math this.math = math;public int getEnglish( return english;public void setEnglish(int english this.english = english;public float pingjun(int english,int math,int chinesefloat a;a = (english+math+chinese/3;return a;本科生类package .shy;public class Undergradute extends Student public U

5、ndergradute(String name, int chinese, int math, int english super(name, chinese, math, english; public float pj(int st,float bkfloat a;a = (bk+st/2;return a; public void benkepd(float aif (a>80System.out.println("该学生为优秀"else if(a>70System.out.println("该学生为良好"else if(a>59

6、System.out.println("该学生为及格"else System.out.println("该学生为不及格"public static void main(String args Undergradute zhansan = (Undergradute new Undergradute("zhangsan", 80, 89,97; int benkekecheng = 55 ;float ggkecheng = zhansan.pingjun(zhansan.getEnglish(, zhansan.getMath(, z

7、hansan.getChinese(;float zongkecheng = zhansan.pj(benkekecheng, ggkecheng;System.out.println("学生名字"+zhansan.getName(;System.out.println(zhansan.getName(+"语文："+zhansan.getChinese(;System.out.println(zhansan.getName(+"数学："+zhansan.getMath(;System.out.println(zhansan.getNa

8、me(+"英语："+zhansan.getEnglish(;System.out.println(zhansan.getName(+"本科课程平均分："+benkekecheng;System.out.println(zhansan.getName(+"总平均分为："+zongkecheng;zhansan.benkepd(zongkecheng; 研究生类package .shy;public class Postgradute extends Student public Postgradute(String name, int

9、chinese, int math, int english super(name, chinese, math, english; public float pj(int st,float bkfloat a;a = (bk+st/2;return a; public void yanjiupd(float aif (a>90System.out.println("该学生为优秀"else if(a>80System.out.println("该学生为良好"else if(a>70System.out.println("该学生

10、为中等"else if(a>59System.out.println("该学生为及格"else System.out.println("该学生为不及格"public static void main(String args Postgradute lisi = (Postgradute new Postgradute("lisi", 98,87,90; int yanjiukecheng = 89;float ggkecheng = lisi.pingjun(lisi.getEnglish(, lisi.getMath

11、(, lisi.getChinese(;float zongkecheng = lisi.pj(yanjiukecheng, ggkecheng;System.out.println("学生名字："+lisi.getName(;System.out.println(lisi.getName(+"语文："+lisi.getChinese(;System.out.println(lisi.getName(+"数学："+lisi.getMath(;System.out.println(lisi.getName(+"英语："+lisi.get