Java课程第三次实验报告.doc

实 验 报 告（ 2015 / 2016学年 第2学期）课程名称JAVA语言程序设计实验名称Java对象和类的使用实验时间2016年 月 日指导单位 计算机学院/软件学院软件工程系指导教师 朱艳梅学生姓名班级学号学院(系)专 业实验名称Java对象和类的使用指导教师朱艳梅实验类型上机实验学时2实验时间一、 实验目的1.掌握类的基本概念，会编写简单的类2.掌握继承类的编写方法二、实验环境(实验设备)1. 每位学生配备计算机一台2. 计算机需安装好JDK和JCreator三、实验内容1.在上一次写的学生类的基础上派生出一个子类大学生类（实验书P115T1），并根据题目要求编写主类测试之。Student.java类代码如下：package 学生类的继承;public class Student private String num;private String classnum;private String name;private String sex;private int age;private static int count=0;public Student(String num,String classnum,String name,String sex,int age)this.num=num;this.classnum=classnum;=name;this.sex=sex;this.age=age;count+;public static int getcount()return count;public String getnum()return num;public String getclassnum()return classnum;public String getname()return name;public String getsex()return sex;public int getage()return age;public void setnum(String num)this.num=num;public void setclassnum(String classnum)this.classnum=classnum;public void setname(String name)=name;public void setsex(String sex)this.sex=sex;public void setage(int age)this.age=age;public String toString()return学生信息+学号：+this.num+t班号：+this.classnum+t姓名:++t性别:+this.sex+t年龄：+this.age;class Collegestudent extends Studentprivate String profession;public Collegestudent(String num, String classnum, String name, String sex,int age,String profession) super(num, classnum, name, sex, age);fession=profession;/ TODO 自动生成的构造函数存根public String getprofession()return profession;public void setprofession(String profession)fession=profession;public String toString()return super.toString()+t专业：+fession;Collegestudenttest.java代码如下：package 学生类的继承;import 学生类的继承.Student;public class CollegestudentTest public static void main(String args) / TODO 自动生成的方法存根Student s1=new Student(001,9801,张三,男,24);System.out.println(构造s1后，班级人数为：+Student.getcount();Student s2=new Student(002,9802,李四,女,21);System.out.println(构造s2后，班级人数为：+Student.getcount();s1.setname(王平);s2.setage(19);System.out.println(s1.toString();System.out.println(s2.toString();if(s1.getage()s2.getage()System.out.println(年龄较大的人的名字为：+s1.getname();elseSystem.out.println(年龄较大的人的名字为：+s2.getname();Collegestudent s3=new Collegestudent(003,9803,林飞,男,21,光电信息科学与工程);System.out.println(s3.toString();s3.setnum(629);s3.setclassnum(9810);s3.setprofession(计算机科学);System.out.println(s3.toString();实验结果：2.定义一个矩形类，计算其面积，定义派生类计算正方形面积。具体要求见课本 P104T5.8MyRectangle.java代码如下：package 矩形类;public class MyRectangle private int Length;private int Width;private int Area;public MyRectangle(int Length,int Width)this.Length=Length;this.Width=Width;public int getLength()return Length;public int getWidth()return Width;public int getArea()return Length*Width;public void setLength(int Length)this.Length=Length;public void setWidth(int Width)this.Width=Width;public String toString()return矩形+长度：+this.Length+t宽度：+this.Width;MyRectangleTest.java代码如下：package 矩形类;import 矩形类.MyRectangle;public class MyRectangleTest public static void main(String args) / TODO 自动生成的方法存根MyRectangle A1=new MyRectangle(3,4);MyRectangle A2=new MyRectangle(8,12);System.out.println(A1.toString();System.out.println(构造A1后，矩形面积为：+A1.getArea();System.out.println(A2.toString();System.out.println(构造A2后，矩形面积为：+A2.getArea();A1.setLength(5);System.out.println(A1.toString();System.out.println(修改A1后，矩形面积为：+A1.getArea();运行结果：3.利用继承关系，定义点类、矩形类、长方体类，并测试之，设计思路见实验书P115。Point.java代码如下：package 类的继承;public class Point private int x;private int y;public Point(int x,int y)this.x=x;this.y=y;public int getx()return x;public int gety()return y;public void setx(int x)this.x=x;public void sety(int y)this.y=y;public String toString()return 点 +横坐标：+this.x+ 纵坐标：+this.y;class Rectangle extends Pointprivate int Length;private int Width;public Rectangle(int x,int y,int Length,int Width)super(x,y);this.Length=Length;this.Width=Width;public int getLength()return Length;public int getWidth()return Width;public int getArea1()return Length*Width;public int getPerimeter()return 2*(Length+Width);public void setLength(int Length)this.Length=Length;public void setWidth(int Width)this.Width=Width;public String toString()return 矩形 +t横坐标：+super.getx()+t纵坐标：+super.gety()+t长度：+this.Length+t宽度：+this.Width+t面积：+this.getArea1()+t周长：+this.getPerimeter();class Cube extends Rectangleprivate int Height;public Cube(int x,int y,int Length,int Width,int Height)super(x,y,Length,Width);this.Height=Height;public int getHeight()return Height;public void setHeight(int Height)this.Height=Height;public int getArea2()return 2*super.getLength()*super.getWidth()+2*super.getLength()*Height+2*super.getWidth()*Height;public int getVolume()return super.getArea1()*Height;public String toString()return长方体+t横坐标：+super.getx()+t纵坐标：+super.gety()+t长度：+super.getLength()+t宽度：+super.getWidth()+t高度：+this.Height+t面积：+this.getArea2()+t体积：+this.getVolume();AllTest.java代码如下：package 类的继承;import 类的继承.Point;public class AllTest public static void main(String args) / TODO 自动生成的方法存根Point A=new Point(2,5);System.out.println(A.toString();Rectangle B=new Rectangle(2,5,3,7);System.out.println(B.toString();Cub