java中计算两个String类型的时间差值

package wb;

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

public class Main {
    public static void main(String[] args) throws ParseException {
        String time1="2021-12-17 12:01:46";
        String time2="2021-12-17 12:01:47";
        SimpleDateFormat tempDate = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        Date date1=tempDate.parse(time1);
        Date date2=tempDate.parse(time2);

        long result=date2.getTime()-date1.getTime();
        System.out.println("差值："+result);
    }
}