Java GregorianCalendar getMaximum()方法

java.util.GregorianCalendar.getMaximum() 方法是Java中的一个内置函数，用于返回作为参数传递给该函数的特定日历域的最大值。对于任何可能的时间值，考虑到getFirstDayOfWeek()、getMinimalDaysInFirstWeek()、getGregorianChange()和getTimeZone()方法的当前值，它是get()方法所返回的最高值。

语法

public int getMaximum(int calendarfield)

参数： 此函数接受一个强制性参数calendarfield，此GregorianCalender实例的最大值将由此函数返回。

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：
程序1 :

// 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

程序2

// 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

**参考资料: ** https://docs.oracle.com/javase/7/docs/api/java/util/GregorianCalendar.html#getMaximum()