Java中的 GregorianCalendar getLeastMaximum() 方法

Java .util.GregorianCalendar.getLeastMaximum()方法是Java中的内置函数，它返回日历字段的最低最大值，作为参数传递给此GregorianCalendar 实例的函数。任何可能的时间值的最低最大值定义为 get 方法返回的最大值，其中getFirstDayOfWeek 、 getMinimalDaysInFirstWeek 、 getGregorianChange和getTimeZone方法的当前值均已考虑在内。
句法：

public int getMaximum(int calendarfield)

参数：此函数接受一个整数类型的强制参数calendarfield ，指的是函数将返回其最小值的日历字段。
返回值：此方法返回一个整数值，该整数值等于指定日历字段的最低最大值。
例子：

Input : DAY_OF_MONTH
Output : 28

Input : WEEK_OF_MONTH
Output : 3

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

Java

// Java program to illustrate getLeastMaximum()
 
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());
 
      // Get lowest maximum for WEEK_OF_MONTH
      int maxm = cal.getLeastMaximum(
                   GregorianCalendar.WEEK_OF_MONTH);
      System.out.println("Lowest Maximum for"+
                   " WEEK_OF_MONTH field :" + maxm);
 
      // Get lowest maximum for DAY_OF_MONTH
      maxm = cal.getLeastMaximum(
                    GregorianCalendar.DAY_OF_MONTH);
      System.out.println("Lowest Maximum for"+
                     " DAY_OF_MONTH field:" + maxm);
   }
}

输出：

Current Date and Time : Wed Aug 01 06:48:43 UTC 2018
Lowest Maximum for WEEK_OF_MONTH field :3
Lowest Maximum for DAY_OF_MONTH field:28

方案二：

Java

// Java program to illustrate getLeastMaximum()
 
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());
 
      // Get lowest maximum for YEAR
      int maxm = cal.getLeastMaximum(
                           GregorianCalendar.YEAR);
      System.out.println("Lowest Maximum for"+
                           " YEAR field :" + maxm);
 
      // Get lowest maximum for HOUR_OF_DAY
      maxm = cal.getLeastMaximum(
                    GregorianCalendar.HOUR_OF_DAY);
      System.out.println("Lowest Maximum for"+
                     " HOUR_OF_DAY field:" + maxm);
   }
}

输出：

Current Date and Time : Wed Aug 01 06:48:45 UTC 2018
Lowest Maximum for YEAR field :292269054
Lowest Maximum for HOUR_OF_DAY field:23

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