java - 当我运行下面的java代码时出现这个错误

Question

当我运行下面的 java 代码时出现此错误

Exception in thread "main" java.lang.Error: Unresolved compilation problem: at my.time.main(time.java:9)

package my;
package com.mkyong.date;

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

public class time {
    public static void main(String[] args) {

        String dateStart = "01/14/2012 09:29:58";
        String dateStop = "01/15/2012 10:31:48";

        //HH converts hour in 24 hours format (0-23), day calculation
        SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");

        Date d1 = null;
        Date d2 = null;

        try {
            d1 = format.parse(dateStart);
            d2 = format.parse(dateStop);

            //in milliseconds
            long diff = d2.getTime() - d1.getTime();

            long diffSeconds = diff / 1000 % 60;
            long diffMinutes = diff / (60 * 1000) % 60;
            long diffHours = diff / (60 * 60 * 1000) % 24;
            long diffDays = diff / (24 * 60 * 60 * 1000);

            System.out.print(diffDays + " days, ");
            System.out.print(diffHours + " hours, ");
            System.out.print(diffMinutes + " minutes, ");
            System.out.print(diffSeconds + " seconds.");

        } catch (Exception e) {
            e.printStackTrace();
        }

    }

}

Answer 1

您设置package两次:

package my;
package com.mkyong.date;

只允许一次。您应该设置您的包以匹配您的类路径。