java这个显示错误应该怎么改呀
public class MyDate
{
private int year,month,day;
private static int thisYear;
static
{
thisYear=2018;
}
public MyDate(int year,int month,int day)
{
this.set(year,month,day);
}
public MyDate()
{
this(1970,1,1);
}
public MyDate(MyDate date)
{
this.set(date);
}
public void set(int year,int month,int day)
{
this.year=year;
this.month=(month>=1&&month<=12)?month:1;
this.day=(day>=1&&day<=31)?day:1;
}
public void set(MyDate date)
{
this.set(date.year,date.month,date.day);
}
public int getYear()
{
return this.year;
}
public int getMonth()
{
return this.month;
}
public int getDay()
{
return this.day;
}
public String toString()
{
return year+"年"+String.format("%02d",month)+"月"+String.format("%02d",day)+"日";
}
public static int getThisYear()
{
return thisYear;
}
public static boolean isLeapYear(int year)
{
return year%400==0||year%100!=0&&year%4==0;
}
public boolean isLeapYear()
{
return isLeapYear(this.year);
}
public boolean equals(Object obj)
{
if(this==obj)
return true;
if(obj instanceof MyDate)
{
MyDate p=(MyDate)obj;
return this.year==(p.year)&&this.month==(p.month)&&this.day==(p.day);
}
return false;
}
public static int daysOfMonth(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:return MyDate.isLeapYear(year)?29:28;
default:return 0;
}
}
public int daysOfMonth()
{
return daysOfMonth(this.year,this.month);
}
public void tomorrow()
{
MyDate date=new MyDate(this);
this.day=this.day%this.daysOfMonth()+1;
if(this.day==1)
{
this.month=this.month%12+1;
if(this.month==1)
date.year++;
}
}
public MyDate yesterday()
{
MyDate date=new MyDate(this);
date.day--;
if(date.day==0)
{
date.month=(date.month-2+12)%12+1;
if(date.month==12)
date.year--;
date.day=daysOfMonth(date.year,date.month);
}
return date;
}
}
class MyDate_ex
{
public static void main(String args[]){
System.out.println("今年是"+MyDate.getThisYear()+",闰年?"+MyDate.isLeapYear(MyDate.getThisYear()));
MyDate d1=new MyDate(2017,12,31);
System.out.println(d1.getYear()+"年,闰年?"+d1.isLeapYear());
MyDate d2=new MyDate(d1);
System.out.println("d1:"+d1+",d2:"+d2+",d1==d2?"+(d1==d2)+",d1.equals(d2)?"+d1.equals(d2));
System.out.print(d1+"的明天是");
d1.tomorrow();
System.out.println(d1+"\n"+d2+"的昨天是"+(d2=d1.yesterday()));
}
}
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