Java中的即时isSupported()方法
可以使用isSupported()Java的Instant类中的方法来检查Instant类是否支持ChronoUnit。此方法需要单个参数，即ChronoUnit进行检查。如果Instant类支持ChronoUnit，则返回true，否则返回false。
演示此的程序如下所示-
示例
import java.time.*;
import java.time.temporal.ChronoUnit;
public class Demo {
public static void main(String[] args) {
Instant i = Instant.now();
System.out.println("The current instant is: " + i);
boolean flag = i.isSupported(ChronoUnit.SECONDS);
if(flag)
System.out.println("The ChronoUnit SECONDS is supported");
else
System.out.println("The ChronoUnit SECONDS is not supported");
}
}输出结果
The current instant is: 2019-02-13T07:08:32.900Z The ChronoUnit SECONDS is supported
现在让我们了解上面的程序。
首先显示当前时刻。然后使用该isSupported()方法检查Instant类是否支持ChronoUnitSECONDS。返回的值存储在标志中，并打印相应的响应。演示这的代码片段如下-
Instant i = Instant.now();
System.out.println("The current instant is: " + i);
boolean flag = i.isSupported(ChronoUnit.SECONDS);
if(flag)
System.out.println("The ChronoUnit SECONDS is supported");
else
System.out.println("The ChronoUnit SECONDS is not supported");