Java Calendar ComputeFields() 方法

2024 年 11 月 3 日 | 阅读 3 分钟

java Calendar 类的 computeFields() 方法是受保护的抽象方法。它将当前的毫秒时间值转换为 fields[] 中的日历字段值。这允许日历对象与设置的新时间保持日历字段值的同步。

语法

参数

不适用

返回值

此方法不返回任何值。

抛出

不适用

示例 1

import java.util.GregorianCalendar;
public class CalendarComputefieldExample1  extends GregorianCalendar{
 public static void main(String[] args) {
     // create a new calendar
      CalendarComputefieldExample1 cal = new CalendarComputefieldExample1();
     // print the current date
      System.out.println("The current date is : " + cal.getTime());
      // clear the calendar
      cal.clear();
      // set a new year and call computeFields()
      cal.set(GregorianCalendar.YEAR, 3018);
      System.out.println("New date is : " + cal.getTime());
      cal.computeFields();
      // print the current date
      System.out.println("New date is : " + cal.getTime());
   }
}

输出

The current date is : Tue Jul 31 20:06:08 PDT 2018
New date is : Thu Jan 01 00:00:00 PST 3018
New date is : Thu Jan 01 00:00:00 PST 3018

示例 2

import java.util.GregorianCalendar;
public class CalendarComputefieldExample2  extends GregorianCalendar{
 public static void main(String[] args) {
      // create a new calendar
      CalendarComputefieldExample2 cal = new CalendarComputefieldExample2();
      // print the current date
      System.out.println("The current date is : " + cal.getTime());
      // clear the calendar
      cal.clear();
      // set a new year and call computeFields()
      cal.set(GregorianCalendar.MONTH, 10);
      System.out.println("New date is : " + cal.getTime());
      cal.computeFields();
      // print the current date
      System.out.println("New date is : " + cal.getTime());
   }
}

输出

The current date is : Tue Jul 31 20:14:45 PDT 2018
New date is : Sun Nov 01 00:00:00 PST 1970
New date is : Sun Nov 01 00:00:00 PST 1970

示例 3

import java.util.GregorianCalendar;
public class CalendarComputefieldExample3 extends GregorianCalendar {
public static void main(String[] args) {
      // create a new calendar
     CalendarComputefieldExample3 cal = new CalendarComputefieldExample3();
      // print the current date
      System.out.println("The current date is : " + cal.getTime());
      // clear the calendar
      cal.clear();
      // set a new year and call computeFields()
      cal.set(GregorianCalendar.DAY_OF_MONTH, 10);
      System.out.println("New date is : " + cal.getTime());
      cal.computeFields();
      // print the current date
      System.out.println("New date is : " + cal.getTime());
   }
}

输出

The current date is : Tue Jul 31 20:19:24 PDT 2018
New date is : Sat Jan 10 00:00:00 PST 1970
New date is : Sat Jan 10 00:00:00 PST 1970

示例 4

import java.util.GregorianCalendar;
public class CalendarComputefieldExample4  extends GregorianCalendar{
public static void main(String[] args) {
      // create a new calendar
  CalendarComputefieldExample4 cal = new CalendarComputefieldExample4();
 // print the current date
       System.out.println("The current date is : " + cal.getTime());
      // clear the calendar
      cal.clear();
      // set a new year and call computeFields()
      cal.set(GregorianCalendar.HOUR, 22);
      cal.set(GregorianCalendar.SECOND, 400);
      cal.set(GregorianCalendar.MINUTE, 70);
      System.out.println("New date is : " + cal.getTime());
      cal.computeFields();
      // print the current date
      System.out.println("New date is : " + cal.getTime());
   }
}

输出

The current date is : Tue Jul 31 20:21:45 PDT 2018
New date is : Thu Jan 01 23:16:40 PST 1970
New date is : Thu Jan 01 23:16:40 PST 1970

下一个主题Java-calendar-equals-method

Java Calendar ComputeFields() 方法

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Java Calendar ComputeFields() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

示例 4

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