Java中的 ChronoField isDateBased() 方法及示例

ChronoField 枚举的isDateBased()方法用于检查此 ChronoField 是否代表日期的组件。从星期几到时代的 ChronoField 常量是基于日期的。

句法：

public boolean isDateBased()

参数：此方法不接受任何内容。

返回值：如果它是日期的组成部分，则此方法返回 true。

下面的程序说明了 ChronoField.isDateBased() 方法：
方案一：

// Java program to demonstrate
// ChronoField.isDateBased() method
  
import java.time.temporal.ChronoField;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // get chronoField
        ChronoField chronoField
            = ChronoField.valueOf("HOUR_OF_DAY");
  
        // apply isDateBased()
        boolean isDateBasedAttribute
            = chronoField.isDateBased();
  
        // print
        System.out.println(
            "HOUR_OF_DAY"
            + " is Date based attribute:"
            + isDateBasedAttribute);
    }
}

输出：

HOUR_OF_DAY is Date based attribute:false

方案二：

// Java program to demonstrate
// ChronoField.isDateBased() method
  
import java.time.temporal.ChronoField;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // get chronoField
        ChronoField chronoField
            = ChronoField.valueOf("YEAR_OF_ERA");
  
        // apply isDateBased()
        boolean isDateBasedAttribute
            = chronoField.isDateBased();
  
        // print
        System.out.println("YEAR_OF_ERA"
                           + " is Date based attribute:"
                           + isDateBasedAttribute);
    }
}

输出：

YEAR_OF_ERA is Date based attribute:true

参考资料：https: Java/time/temporal/ChronoField.html#isDateBased()