目录

boolean isSet(int field)

描述 (Description)

java.util.Calendar.isSet(int field)方法检查给定的日历field是否具有值set.Cases表示该值已由get方法调用触发的内部字段计算设置。

声明 (Declaration)

以下是java.util.Calendar.isSet方法的声明

public final boolean isSet(int field)

参数 (Parameters)

field - 要检查的字段。

返回值 (Return Value)

如果给定的日历字段具有值集,则此方法返回true ; 否则是false

异常 (Exception)

NA

例子 (Example)

以下示例显示了java.util.calendar.isSet()方法的用法。

package com.iowiki;
import java.util.*;
public class CalendarDemo {
   public static void main(String[] args) {
      // create a calendar
      Calendar cal = Calendar.getInstance();
      // display the current calendar
      System.out.println("Current Day is " + cal.get(Calendar.DAY_OF_MONTH));
      // determine if the given calendar field has a value set
      boolean b = cal.isSet(Calendar.DAY_OF_MONTH);
      System.out.println("Day of month is set: " + b);
      // clear day of month
      cal.clear(Calendar.DAY_OF_MONTH);
      // determine if the given calendar field has a value set
      b = cal.isSet(Calendar.DAY_OF_MONTH);
      System.out.println("Day of month is set: " + b);
   }
}

让我们编译并运行上面的程序,这将产生以下结果 -

Current Day is 6
Day of month is set: true
Day of month is set: false
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