解决方案
以下示例向我们展示了如何使用 Calender 的 add() 方法向日期添加时间。
import java.util.*;
public class Main {
public static void main(String[] args) throws Exception {
Date d1 = new Date();
Calendar cl = Calendar. getInstance();
cl.setTime(d1);
System.out.println("today is " + d1.toString());
cl. add(Calendar.MONTH, 1);
System.out.println("date after a month will be " + cl.getTime().toString() );
cl. add(Calendar.HOUR, 70);
System.out.println("date after 7 hrs will be " + cl.getTime().toString() );
cl. add(Calendar.YEAR, 3);
System.out.println("date after 3 years will be " + cl.getTime().toString() );
}
}