实验七：类的多态性
Package zuoye7;
public class MyDate {
private int year,month,day;
private static int thisYear;
public int getMonth() {
return month;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public void setYear(int year) {
this.year = year;
}
public void setMonth(int month) {
this.month = month;
}
public int getYear() {
return year;
}
static {
thisYear=2018;
}
public MyDate(int year,int month,int day){
this.day=day;
this.month=month;
this.year=year;
}
public MyDate(MyDate birthdate){
this(1900,1,1);
System.out.println("默认出生日期数据");
}
public static void set (){
}
public String toString(){
return year+" "+month+" "+day;
}
}
public class Person {
public String name;
public static MyDate birthdate;
public String gender,province,city;
private static int count=0;
public Person(String name,MyDate birthdate,String gender,String province,String city) {
this.set(name,birthdate,gender,province,city);
count++;
}
public Person(String name,MyDate birthdate) {
this(name,birthdate,"","", name);
}
public Person() {
this("",new MyDate(birthdate));
}
@SuppressWarnings("static-access")
public Person(Person per)
{
this(per.name,new MyDate(per.birthdate),per.gender,per.province,per.city);
}
public void finalize() {
System.out.println("释放对象("+this.toString()+")");
Person.count--;
}
public static void howMany()
{
System.out.println(Person.count+"个Person对象，");
}
@SuppressWarnings("static-access")
public void set(String name,MyDate birthdate,String gender,String province,String city) {
this.name=name==null?"":name;
this.birthdate=birthdate;
this.province=province==null?"":province;
this.city=city==null?"":city;
}
public void set(String name,MyDate birthdate) {
this.set(name, birthdate,"","", name);
}
@SuppressWarnings("static-access")
public String toString() {
return this.name+","+(this.birthdate==null?"":birthdate.toString())+","+this.gender+","+this.city;
}
public void set(String string, String string2, String string3, boolean b) {
// TODO Auto-generated method stub
}
}
Import java.util.Scanner;
public class Student<birthdate, birthdate1> extends Person
{
public String department,speciality,number;
public boolean member;
private int birthdate1;
private static int count=0;
public Student(String name,MyDate birthdate,String gender,String province,String city,
String department,String speciality,String number,boolean member) {
super(name,birthdate,gender,province,city);
this.set(speciality, department,number,member);
count++;
}
public Student()
{
super();
this.set("","","",false);
Student.count++;
}
public Student(Person person,String department,String speciality,String number,boolean member)
{
super(person);
this.set(number,birthdate,speciality,member);
Student.count++;
}
public Student(@SuppressWarnings("rawtypes") Student stu) {
this(stu,stu.department,stu.speciality,stu.number,stu.member);
}
public void finalize()
{
super.finalize();
Student.count--;
}
public static void howMany() {
Person.howMany();
System.out.println(Student.count+"个Student对象");
}
public void set(String department,MyDate birthdate,String number,boolean member) {
Object departemnt = null;
this.department=departemnt==null?"":department;
this.speciality=birthdate==null?"":number;
this.member=member;
}
@SuppressWarnings("static-access")
public void chazhao(String name) {
@SuppressWarnings("unused")
int m;
int h = 0;
@SuppressWarnings("rawtypes")
Student m1=new Student();
String n;
@SuppressWarnings("resource")
Scanner shuru=new Scanner(System.in);
System.out.println("请输入你要查询的姓n");
n=shuru.nextLine();
if(m1.name==n) {
System.out.println(m1.name);
}
System.out.println("请输入你要查询的生日n");
n=shuru.nextLine();
if(m1.birthdate1==h) {
System.out.println(m1.birthdate);
}
System.out.println("请输入你要查询的城市");
n=shuru.nextLine();
if(m1.city==n) {
System.out.println(m1.city);
}
}
public String toString() {
return super.toString()+","+this.department+","+this.speciality+","+this.number+(member?",团员":"");
}
@SuppressWarnings("null")
public static void main(String[] args)
{
Person per=new Person("李小明",new MyDate(1994,3,15),"男","湖南省","长沙市");
@SuppressWarnings("rawtypes")
Student stu1=new Student(per,"计算机","计算机科学与技术","211994001",true);
@SuppressWarnings("rawtypes")
Student stu2=new Student(stu1);
Person stu = null;
stu.set("张丽",new MyDate(1998,4,5),"女","湖北省","武汉市");
stu.set("经济管理系","信息管理专业","3211998003",true);
Student.howMany();
System.out.println("per: "+per.toString()+"\nstu1:"+stu1.toString()+"nstu2:"+stu2);
stu2.finalize();
Student.howMany();
}
}
心得: 在该实验中只是根据书上的例子敲写进去的，有好多地方还不太完整，想看同学编写的程序也看不明白。在实验中有许多逻辑错误，程序只是完成了一部分，还有待改善。
