Java作业三

1、设计一个日期类。该类中有一些方法需要实现
a)可以根据输入的年份判断判断是否为闰年
b)可以根据当前输入的日期判断是星期几

package homework_three;
class Date{
	public void IfLeap(int year) {
		if(year%4==0 && year%100!=0 || year%400==0)
			System.out.println(year+"是闰年");
		else
			System.out.println(year+"不是闰年");

	}
	public int GetWeek(int year,int month,int day) {
		if(month == 1 || month == 2){
			month += 12;
			year--;
		}
		int c = year / 100;
		int y = year % 100;
		int m = month;
		int d = day;
		int w = c / 4 - 2 *c + y + y / 4 + 26*(m+1) / 10 + d - 1;
		if(w < 0)
			return (w + (-w / 7 + 1) * 7) % 7;
		return w % 7;
	}
}
public class three {
	public static void main(String[] args) {
		Date date = new Date();
		date.IfLeap(2020);
		System.out.println("星期:"+date.GetWeek(2020,11,28));
	}
}

2、设计一个水果类，包括水果的类型，适合吃的季结，作用；设计其子类苹果类，适合在冬天吃，作用减肥；设计水果的子类西瓜类，适合在夏天吃，解渴；设计水果的子类橙子，适合在春天吃，补充维生素；设计水果的子类梨，适合在秋天吃，止咳。任意给出一种水果，给出其类型、适合的季结、功效等信息；

package homework_three;
class Fruit{
	String name;
	String season;
	String effect;
	public String getName() { 
        return name; 
        }
      /*public void setName(String name) { 
          this.name = name; 
          } */
      public String getSeason() { 
          return season; 
        }
      /*public void setSeason(String season) { 
          this.season = season; 
        }*/
      public String getEffect() { 
          return effect; 
        }
      /*public void setEffect(String effect) { 
          this.effect = effect; 
        }*/
}
class Apple extends Fruit{
    public Apple() { 
        name = "苹果";
        season="冬季";
        effect="减肥";
      }
}
class Melon extends Fruit{
    public Melon() { 
        name = "西瓜"; 
        season="夏季";
        effect="解渴";
      } 
}
class Orange extends Fruit{
    public Orange() { 
        name = "橙子";
        season="春季";
        effect="补充维生素";
      } 
}
class Pear extends Fruit{
    public Pear() { 
        name = "梨";
        season="秋季";
        effect="止咳";
      } 
}
public class three_2 {
	public static void main(String[] args) {
		Fruit apple = new Apple();//只需要更改Apple为其他水果类
		System.out.println(apple.getName());
		System.out.println(apple.getSeason());
		System.out.print(apple.getEffect());
	}
}