Java实验报告样本

信息科学与工程学院《Java程序设计》上机实验报告专业班级电技电信0901 姓名刘雄楚学号 200912135020 实验时间 2011 年 9 月 30 日指导教师程骅成绩实验名称面向对象程序设计的继承、多态等特性的练习实验目的1)掌握类的继承机制。

2)熟悉类中成员变量和方法的访问控制。

3)熟悉方法或构造方法多态性。

4)熟悉接口的定义方法。

1class Person{public String name;public char sex;public int age;Person(String name,char sex,int age){=name;this.sex=sex;this.age=age;}}class Student extends Person{public String classno;public String sno;public void updateAge(int age){this.age=age;}public String toString(){System.out.println(+" "+this.sex+" "+this.age+""+this.classno+" "+this.sno);return +" "+this.sex+" "+this.age+" "+this.classno+" "+this.sno;}Student(String name,char sex,int age,String classno,String sno){ super(name,sex,age);this.classno=classno;this.sno=sno;}}public class TestStudentPerson{public static void main(String args[]){Student s1=new Student("jeck",'n',20,"12233344","2");s1.updateAge(21);s1.toString();}}2public class TestVirtualInvoke {static void doStuff(Shape s){s.draw();}public static void main(String[] args) { Circle c=new Circle();Triangle t=new Triangle();Line l=new Line();doStuff(c);doStuff(t);doStuff(l);}}class Shape{void draw(){System.out.println("Shape Drawing");}}class Circle extends Shape{void draw(){System.out.println("Shape Circle");}}class Triangle extends Shape{void draw(){System.out.println("Shape Triangle");}}class Line extends Shape{void draw(){System.out.println("Shape Line");}}使用抽象类abstractabstract class Shape{abstract void draw();}class Circle extends Shape{void draw(){System.out.println("Shape Circle");}}class Triangle extends Shape{void draw(){System.out.println("Shape Triangle");}}class Line extends Shape{void draw(){System.out.println("Shape Line");}}使用interface接口方法interface Shape{public void draw();}class Circle implements Shape{public void draw(){System.out.println("Shape Circle");}}class Triangle implements Shape{public void draw(){System.out.println("Shape Triangle");}}class Line implements Shape{public void draw(){System.out.println("Shape Line");}}思考题：import java.util.*;abstract class Employee{ String name;long no;static long id=1000;abstract double getPay();Employee(String name){ =name;id=id+1;}};class Manager extends Employee{double pay=8000;double getPay(){return 8000;}Manager(String name){super(name);no=id;}public String toString(){return"name:"+name+" no:"+no+" pay:8000";} };class Sale extends Employee{ long saleNum;double getPay(){return saleNum*0.04;}Sale(String name,long saleNum){super(name);no=id;this.saleNum=saleNum;}public String toString(){return"name:"+name+" no:"+no+" pay:"+getPay();} }class Tech extends Employee{ long salaryHours;double getPay(){return salaryHours*100; }Tech(String name,long salaryHours){super(name);no=id;this.salaryHours=salaryHours;}public String toString(){return"name:"+name+" no:"+no+" pay:"+getPay();}};class EmployApp{public static void main(String args[]){Vector s=new Vector();Employee em;double numPay=0;s.addElement(new Sale("aa",111000));s.addElement(new Sale("bb",122000));s.addElement(new Tech("cc",35));s.addElement(new Tech("dd",30));s.addElement(new Manager("ee"));Enumeration e=s.elements();while(e.hasMoreElements()){em=(Employee)e.nextElement();numPay=numPay+em.getPay();System.out.println(em);}System.out.println("总工资:"+numPay);}};心得：此次试验更多更广的运用了类的继承这一特性，使得程序更简单易读，同时运用到了抽象类与接口的使用方法，总体而言是上一次实验的引申，进一步加深了知识的运用，学习了更多的方法以及构造方法的运用方式。