Java程序设计 实验二 面向对象程序设计

Java程序设计 实验二 面向对象程序设计

实验目的

	通过编程和上机实验，掌握类和构造方法的定义及创建对象的方法，掌握类的封装及继承原则，正确使用重载和覆盖等多态概念设计可复用方法，熟悉包、接口的使用方法，掌握面向对象的程序设计方法。

实验内容

1、编写MyDate类，完善上次实验中的人员信息录入，实现日期合法性判断，包括大小月和闰年。

package shiyaner;
import java.util.*;
class Student {private String name;private MyDate mydate;private int age;private double score;public Student(String n,int y,int m,int d,double s){mydate=new MyDate(y, m, d);name=n;score=s;Calendar calendar = Instance();ar<=(Calendar.YEAR)){h&(Calendar.MONTH)+1){	    ar;	 		  }else h&(Calendar.MONTH)+1){ar;}else{if(mydate.day<=(Calendar.DATE)){ar;  }else ar;}}else age=-1;}public int getAge(){return age;}	 public String toString(){return "姓名："+name+"t年龄："+age+"t出生日期："+ar+"年"+h+"月"+mydate.day+"日tJAVA课程成绩："+score;}
}class MyDate {int year;int month;int day;	public MyDate(int y,int m,int d){year=y;month=m;day=d;}public boolean isVaildYear(int year){if(year<0||year>2020)return false;else return true;}	public boolean isVaildMonth(int month){if(month<1||month>12)return false;else return true;}public boolean isVaildDay(int year,int month,int day){if(day<1||day>theDaysOfMonth(year,month))return false;else return true;}public boolean isLeapYear(int year){if(year%400==0||year%100!=0&&year%4==0)return true;else return false;}public int theDaysOfMonth(int year,int month){switch(month) {case 1:case 3:case 5:case 7:case 8:case 10: case 12:return 31;case 4:case 6:case 9:case 11:return 30;case 2:if(isLeapYear(year))return 29;else return 28;default: return -1;}}public boolean isVaildDate(int year,int month,int day){if(isVaildYear(year)&&isVaildMonth(month)&&isVaildDay(year,month,day))		return true;					else return false;		}
}
public class shiyaner_yi {public static void main(String[] args){Student stu[]=new Student[999];MyDate md[]=new MyDate[999];double sc[]=new double[999];//记录成绩double sa[]=new double[999];//记录年龄double sumsc=0,sumsa=0;@SuppressWarnings("resource")Scanner ss=new Scanner(System.in);int i=0;while(true){System.out.println("请输入学生的姓名、出生年月日和java课程实验成绩:");		String name;int year,month