Java中的 GregorianCalendar getMaximum() 方法

Java .util.GregorianCalendar.getMaximum()方法是Java中的一个内置函数，它返回作为参数传递给函数的特定日历字段的最大值。对于任何可能的时间值，它是 get() 方法返回的最大值，同时考虑 getFirstDayOfWeek()、getMinimalDaysInFirstWeek()、getGregorianChange() 和 getTimeZone() 方法的当前值。

句法：

public int getMaximum(int calendarfield)

参数：此函数接受一个强制参数calendarfield ，该GregorianCalender 实例的最大值将由函数返回。

返回值：此方法返回此GregorianCalender 实例的指定日历字段的最大值。

例子：

Input : DAY_OF_MONTH
Output : 31

Input : WEEK_OF_MONTH
Output : 6

下面的程序说明了Java.util.GregorianCalendar.getMaximum()函数：
方案一：

// Java Program to illustrate getMaximum() function
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Create a new calendar
        GregorianCalendar cal = (GregorianCalendar)
                     GregorianCalendar.getInstance();
  
        // Display the current date and time
        System.out.println("Current Date and Time : "
                                    + cal.getTime());
  
        // Display maximum for WEEK_OF_MONTH
        int maxm = cal.getMaximum
                   (GregorianCalendar.WEEK_OF_MONTH);
        System.out.println("Maximum for WEEK_OF_MONTH field :"
                                                     + maxm);
  
        // Display maximum for DAY_OF_MONTH
        maxm = cal.getMaximum
                    (GregorianCalendar.DAY_OF_MONTH);
        System.out.println("Maximum for DAY_OF_MONTH field:"
                                                    + maxm);
    }
}

输出：

Current Date and Time : Fri Jul 27 12:44:38 UTC 2018
Maximum for WEEK_OF_MONTH field :6
Maximum for DAY_OF_MONTH field:31

方案二：

// Java Program to illustrate getMaximum() function
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        // Create a new calendar
        GregorianCalendar cal = (GregorianCalendar)
                          GregorianCalendar.getInstance();
  
        // Display the current date and time
        System.out.println("Current Date and Time : "
                           + cal.getTime());
  
        // Display maximum for YEAR
        int maxm = cal.getMaximum(GregorianCalendar.YEAR);
        System.out.println("Maximum for YEAR field :"
                           + maxm);
  
        // Display maximum for HOUR_OF_DAY
        maxm = cal.getMaximum(GregorianCalendar.HOUR_OF_DAY);
        System.out.println("Maximum for HOUR_OF_DAY field:"
                           + maxm);
    }
}

输出：

Current Date and Time : Fri Jul 27 12:44:40 UTC 2018
Maximum for YEAR field :292278994
Maximum for HOUR_OF_DAY field:23

参考： https: Java/util/GregorianCalendar.html#getMaximum()