比较日期，如果早返回-1，晚返回1，相等返0

[java]代码库

import java.util.Scanner;
public class Main{
    public static void main(String[] args) {
         Scanner scan = new Scanner(System.in);      
         int y1 = scan.nextInt();      
         int m1 = scan.nextInt();      
         int d1 = scan.nextInt();
         MyDate p1 = new MyDate(y1,m1,d1);
         int y2 = scan.nextInt();      
         int m2 = scan.nextInt();      
         int d2 = scan.nextInt();
         MyDate p2 = new MyDate(y2,m2,d2);
         p1.print();
         p1.compare(p2);
         scan.close(); 
    }
}
class MyDate {
	private int year;
	private int month;
    private int day;
    public MyDate (int y, int m, int d)
    {
    	year = y;
    	month = m;
    	day = d;
    }
	
    public int getYear() {return year;}
    public int getMonth() {return month;}
    public int getDay() {return day;}
    
    public void setYear(int y) { year = y; }
    public void setMonth(int m) { month = m ;}
    public void setDay(int d) { day = d; }
	
	public void print(){
		System.out.print(month + "/"+day+"/"+year+ " ");
	}
	public void compare(MyDate d)
    {
   	 if(this.year < d.getYear())
   		 System.out.print("-1");
   	 else if( this.year > d.getYear())
   		System.out.print("1");
   	 else if (this.year == d.getYear())
   	 {
   		if(this.month < d.getMonth())
      		 System.out.print("-1");
      	 else if( this.month > d.getMonth())
      		System.out.print("1");
      	 else if (this.month == d.getMonth())
      	 {
      		if(this.day< d.getDay())
      	   		 System.out.print("-1");
      	   	 else if( this.day > d.getDay())
      	   		System.out.print("1");
      	   	 else if(this.day == d.getDay())
      	   	System.out.print("0");
      	 }
   	 }
    }
}