Java中Date类型数据比较方法

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class demo001 {
public static void main(String[] args) throws InterruptedException {
Date date1 = new Date();
Date date2 = new Date();//第一种
//		Thread.sleep(4*1000);
//		Date date2 = new Date();//第二种
System.out.println("");
System.out.println("***************************************");
System.out.println(compareDate(date1,date2));
System.out.println("***************************************");
System.out.println(date1.getTime());
System.out.println(date2.getTime());
}
private static int compareDate(Date date1,Date date2) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return sdf.format(date1).compareTo(sdf.format(date2));
}
}