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📜  Java中的 Year isSupported(TemporalField) 方法及示例

📅  最后修改于: 2022-05-13 01:55:27.094000             🧑  作者: Mango

Java中的 Year isSupported(TemporalField) 方法及示例

Year类的isSupported(TemporalField)方法用于检查指定字段是否被 Year 类支持,即使用该方法我们可以检查是否可以针对指定字段查询此 Year 对象。

ChronoField 支持的字段有:

  • YEAR_OF_ERA
  • 时代

所有其他 ChronoField 实例将返回 false。

句法:

public boolean isSupported(TemporalField field)

参数:此方法只接受一个参数字段,该字段表示要检查的字段。
返回值:如果该字段在今年支持,则此方法返回布尔值 true,否则返回 false。

下面的程序说明了 isSupported(TemporalField) 方法:

方案一:

Java
// Java program to demonstrate
// Year.isSupported(TemporalField) method
 
import java.time.*;
import java.time.temporal.*;
 
public class GFG {
    public static void main(String[] args)
    {
        // create a Year object
        Year year = Year.of(2019);
 
        // print instance
        System.out.println("Year :"
                           + year);
 
        // apply isSupported() method
        boolean value
            = year.isSupported(
                ChronoField.YEAR_OF_ERA);
 
        // print result
        System.out.println("YEAR_OF_ERA Field is supported by Year class: "
                           + value);
    }
}


Java
// Java program to demonstrate
// Year.isSupported(TemporalField) method
 
import java.time.*;
import java.time.temporal.*;
 
public class GFG {
    public static void main(String[] args)
    {
        // create a Year object
        Year year = Year.of(2022);
 
        // print instance
        System.out.println("Year :"
                           + year);
 
        // apply isSupported() method
        boolean value
            = year.isSupported(
                ChronoField.MILLI_OF_SECOND);
 
        // print result
        System.out.println("MilliSecond Field is supported: "
                           + value);
    }
}


输出

Year :2019
YEAR_OF_ERA Field is supported by Year class: true

方案二:

Java

// Java program to demonstrate
// Year.isSupported(TemporalField) method
 
import java.time.*;
import java.time.temporal.*;
 
public class GFG {
    public static void main(String[] args)
    {
        // create a Year object
        Year year = Year.of(2022);
 
        // print instance
        System.out.println("Year :"
                           + year);
 
        // apply isSupported() method
        boolean value
            = year.isSupported(
                ChronoField.MILLI_OF_SECOND);
 
        // print result
        System.out.println("MilliSecond Field is supported: "
                           + value);
    }
}
输出
Year :2022
MilliSecond Field is supported: false

参考:
Java Java )