实验一：类和对象 31011134倪庆雨).doc

实验一：类和对象【实验目的】1 理解对象和类，掌握类的定义及如何创建一个对象；2 掌握构造方法的运用；3 掌握方法的定义和参数传递；4. 掌握类的继承机制。【实验准备】一、复习配套教材相关章节的内容；二、预习本次实验；【实验内容】1编写一个程序，显示水果的定购行情。定义一个带有参数的构造方法，这些参数用于存放产品名，数量和价格。在主程序中输出三种不同的水果。package fruit;public class Fruits String goodsname;int goodsamount;double goodsprice;public Fruits(String goodsname,int goodsamount,double goodsprice) this.goodsname=goodsname; this.goodsamount=goodsamount; this.goodsprice=goodsprice;public void showinfo() System.out.println(产品名为+this.goodsname);System.out.println(产品数量为+this.goodsamount);System.out.println(产品价格为+this.goodsprice);package fruit;public class Fruit /* * param args */public static void main(String args) / TODO Auto-generated method stubFruits f=new Fruits(apple,2,4);f.showinfo();Fruits f1=new Fruits(banana,2,3);f1.showinfo();Fruits f2=new Fruits(peach,2,2);f2.showinfo();2. 编写一个学生类，封装学生的学号、姓名、成绩等信息。再编写一个主类，主类中有一个打印学生信息的方法，该方法接受学生类对象为参数，并依次输出学生信息；main() 方法中生成学生类对象，并调用打印方法输出学生信息。package student;public class Student privateString studentnumber;public String getStudentnumber() return studentnumber;public void setStudentnumber(String studentnumber) this.studentnumber = studentnumber;public String getStudentname() return studentname;public void setStudentname(String studentname) this.studentname = studentname;public double getStudentgrade() return studentgrade;public void setStudentgrade(double studentgrade) this.studentgrade = studentgrade;privateString studentname;privatedouble studentgrade;publicStudent()public Student(String studentnumber, String studentname, double studentgrade) this.studentnumber = studentnumber;this.studentname = studentname;this.studentgrade = studentgrade;package student;public class Students public static void showinfo(Student s)System.out.println(学号为+s.getStudentnumber();System.out.println(姓名为+s.getStudentname();System.out.println(成绩为 +s.getStudentgrade(); /* * param args */public static void main(String args) / TODO Auto-generated method stubStudent s=new Student(31011134,倪庆雨,60);Students.showinfo(s);3、编写一个程序，用于创建一个名字Employee的父类和两个名为Manager和Director的子类。Employee类包含3个属性和一个方法，属性为name,basic和address,方法名为show,用于显示这些属性值。Manager类有一个名为department的属性，Director类有一个名为transport的附加属性。创建Manager和Director的类并显示其详细信息。package com.extend;public class Employee String name;public Employee(String name, String basic, String adress) super(); = name;this.basic = basic;this.adress = adress;String basic;String adress;public Employee ()public void show()System.out.println(姓名为+);System.out.println(基础为+this.basic);System.out.println(地址为+this.adress);package com.extend;public class Manager extends Employee String department;publicManager()public Manager(String name, String basic, String adress,String department) super(name, basic, adress);this.department=department;/ TODO Auto-generated constructor stubpublic void show()super.show();System.out.println(部门为+this.department);package com.extend;public class Director extends Employee String transport;public Director(String name, String basic, String adress,String transport) super(name, basic, adress);/ TODO Auto-generated constructor stubpublic Director()public void show()super.show();System.out.println(传输为+this.transport);package com.extend;public class Extends /* * param args */public static void main(String args) / TODO Auto-generated method stubEmployee e=new Employee(小明,18,淮安);e.show();Manager m=new Manager(小刚,19,南京,商学院);m.show();Director d=new Director(小洪,23,泰州,火车);d.show();4、编写一个程序，用于重写父类Addition中名为add()的方法，该方法没有实质性的操作，仅输出一条信息。add()方法在NumberAddition类中将两个整数相加，而在TextConcatenation类则连接两个String字符串。创建主类测试两个子类中的add()方法。package lab1;public class Addition public void add()System.out.println(该方法没有实质性的操作，仅输出一条信息);package lab1;public class NumberAddition extends Addition double result;public void add(double number1,double number2)result=number1+number2;System.out.println(两个数相加为+result);package lab1;public class TextConcatenation extends Addition String result2;public void add(String number3,String number4)result2=number3+number4;System.out.println(连接字符串为+result2);package lab1;public class A /* * param args */public static void main(String args) / TOD