Java Calendar isSet() 方法

2024年11月3日 | 阅读 2 分钟

java.util.Calendar 类的 isSet() 方法是一个 final 方法，它返回一个布尔值。该方法检查传入的参数值是否已设置。如果未设置，则返回 false，否则返回 true。

语法

参数

field - 日历字段。

返回值

返回一个布尔值。

抛出

不抛出异常。

示例 1

import java.util.*;
public class JavaCalendarisSetExample1 {
   public static void main(String[] args) {
      // create a calendar object calobj
      Calendar calobj = Calendar.getInstance();
      // display the current date
      System.out.println(" Today " + calobj.getTime());
      // determine if the given calendar field has a value set
      boolean b = calobj.isSet(Calendar.YEAR);
      System.out.println("Year is set: " + b);
      calobj.clear(Calendar.YEAR);
      // determine if the given calendar field has a value set
      b = calobj.isSet(Calendar.YEAR);
      System.out.println("Year is set: " + b);
   }
}

输出

Today Mon Aug 13 22:21:16 PDT 2018
Year is set: true
Year is set: false

示例 2

import java.util.*;
public class JavaCalendarisSetExample2 {
   public static void main(String[] args) {
      // create a calendar object calobj
      Calendar calobj = Calendar.getInstance();
      // display the current date
      System.out.println(" Today " + calobj.getTime());
      // determine if the given calendar field has a value set
      boolean b = calobj.isSet(Calendar.YEAR);
      System.out.println("Year is set: " + b);
       boolean M = calobj.isSet(Calendar.MONTH);
      System.out.println("Month is set: " + M);
       boolean d = calobj.isSet(Calendar.DAY_OF_WEEK);
      System.out.println("Day of week is set: " + d);
      calobj.clear();
      // determine if the given calendar field has a value set
      System.out.println("After clearing calendar");
      b = calobj.isSet(Calendar.YEAR);
      System.out.println("Year is set: " + b);
      M = calobj.isSet(Calendar.MONTH);
      System.out.println("Month is set: " + M);
     d = calobj.isSet(Calendar.DAY_OF_WEEK);
      System.out.println("Day of week is set: " + d);
   }
}

输出

Today Mon Aug 13 22:29:19 PDT 2018
Year is set: true
Month is set: true
Day of week is set: true
After clearing calendar
Year is set: false
Month is set: false
Day of week is set: false

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Java Calendar isSet() 方法

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示例 1

示例 2

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Java Calendar isSet() 方法

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示例 1

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