Java Calendar clear() 方法

2024年11月3日 | 阅读 2 分钟

java.util.Calendar.clear() 方法将此 Calendar 的给定日历字段值和时间值设置为未定义。Calendar 实现类可能会使用默认字段值来进行日期和时间计算。

语法

参数

Field - 要设置为未定义的日历字段。

返回值

此方法不返回任何值。

抛出

不适用

示例 1

import java.util.Calendar;
public class CalendarClearExample1 {    
   public static void main(String[] args) {
      // create a calendar
       Calendar cal = (Calendar) Calendar.getInstance();
      // display the current date and time
      System.out.println("Current Calendar Date: " + cal.getTime());
      // use clear method to set year as undefined.
       cal.clear(Calendar.YEAR);
      // print the result
     System.out.println("The calendar shows : " + cal.getTime());      
   }
}

输出

Current Calendar Date: Mon Jul 30 06:35:54 PDT 2018
The calendar shows : Thu Jul 30 06:35:54 PDT 1970

示例 2

import java.util.Calendar;
public class CalendarclearExample2 {   
 public static void main(String[] args) {
      // create a calendar
   Calendar cal = (Calendar) Calendar.getInstance();
      // display the current date and time
      System.out.println("Current Calendar Date: " + cal.getTime());      
      // use clear method to set month as undefined.
      cal.clear(Calendar.MONTH);
      // print the result
      System.out.println("The calendar shows : " + cal.getTime());
   }
}

输出

Current Calendar Date: Mon Jul 30 06:39:17 PDT 2018
The calendar shows : Tue Jan 30 06:39:17 PST 2018

示例 3

import java.util.Calendar;
public class CalendarClearExample3 {   
 public static void main(String[] args) {
      // create a calendar
      Calendar cal = (Calendar) Calendar.getInstance();
      // display the current date and time
      System.out.println("Current Calendar Date: " + cal.getTime());     
      // use clear method to set month as undefined.
      cal.clear(Calendar.DAY_OF_MONTH);
      // print the result
      System.out.println("The calendar shows : " + cal.getTime());      
      cal.clear(Calendar.HOUR);
      cal.clear(Calendar.MINUTE);
      cal.clear(Calendar.SECOND);
      // print the result
      System.out.println("The calendar shows : " + cal.getTime());
   }
}

输出

Current Calendar Date: Mon Jul 30 06:45:15 PDT 2018
The calendar shows : Mon Jul 30 06:45:15 PDT 2018
The calendar shows : Mon Jul 30 06:00:00 PDT 2018

示例 4

import java.util.Calendar;
public class  CalendarClearExample4 {    
public static void main(String[] args) {
      // create a calendar
      Calendar cal = (Calendar) Calendar.getInstance();
     // display the current date and time
      System.out.println("Current Calendar Date: " + cal.getTime());     
      cal.clear(Calendar.HOUR);
      cal.clear(Calendar.MINUTE);
      cal.clear(Calendar.SECOND);
      // print the result
      System.out.println("The calendar shows : " + cal.getTime());
   }
}

输出

Current Calendar Date: Mon Jul 30 06:48:47 PDT 2018
The calendar shows : Mon Jul 30 06:00:00 PDT 2018

下一主题Java-calendar-clone-method

Java Calendar clear() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

示例 4

联系信息

关注我们

教程

面试题

在线编译器

Python

Java

.Net Framework

AI, ML and Data Science

Cloud Technology

B.Tech and MCA

Web Technology

PHP

Software Testing

Technical Interview

Java Interview

Python

Web Interview

Database Interview

B.Tech / MCA

Important Interview

Software Testing Interview

Company Interviews

Online Compilers

Multiple Choice Questions

Java EnumMap

Java DriverManager

Java ThreadLocal

Java StringBuilder

Java StringBuffer

Java Short

Java Float

Java HashSet

Java ThreadLocalRandom

Java ThreadGroup

Java Double

Java Throwable

Java PriorityQueue

Java Matcher

Java 方法

Java 枚举

Java TreeSet

Java TimeZone

Java System

Java Locale

Java Scanner

Java Random

Java Currency

Java Character

Java Timertask

Java Timer

Java Process

Java Calendar

Java Calendar clear() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

示例 4

相关帖子

Java Calendar setTimeInMillis() 方法

Java Calendar internalGet() 方法

Java Calendar isSet() 方法

Java Calendar getTimeZone() 方法

Java Calendar toString() 方法

Java Calendar setMinimalDaysInFirstWeek() 方法

Java Calendar getMinimum() 方法

Java Calendar isLenient() 方法

Java Calendar getTime() 方法

Java Calendar get() 方法

订阅 Tpoint Tech

联系信息

关注我们

教程

面试题

在线编译器