Java ChronoPeriod isNegative()方法及实例

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Java ChronoPeriod isNegative()方法及实例

Java中 ChronoPeriod类isNegative()方法 用于检查周期中的YEAR、MONTH、DAYS三者是否为负数。

语法

boolean isNegative()

参数: 该方法不接受任何参数。

返回值: 如果给定时期的年、月、日三个值中的任何一个为负值,该方法返回True,否则将返回false。

以下程序说明了Java中的isNegative()方法。

程序1 :

// Java code to show the function isNegative()// to check whether any of the three given units// YEAR, MONTH, DAY is negative  import java.time.*;import java.time.chrono.*;import java.time.temporal.ChronoUnit;  public class ChronoPeriodDemo {      // Function to check if any of the three    // YEAR, MONTH, DAY is negative    static void ifNegative(int year, int months, int days)    {        ChronoPeriod period = Period.of(year, months, days);        System.out.println(period.isNegative());    }      // Driver Code    public static void main(String[] args)    {        int year = -12;        int months = 3;        int days = 31;          ifNegative(year, months, days);    }}

输出:

true

程序2 :

// Java code to show the function isNegative()// to check whether any of the three given units// YEAR, MONTH, DAY is negative  import java.time.*;import java.time.chrono.*;import java.time.temporal.ChronoUnit;  public class ChronoPeriodDemo {      // Function to check if any of the three    // YEAR, MONTH, DAY is negative    static void ifNegative(int year, int months, int days)    {        ChronoPeriod period = Period.of(year, months, days);        System.out.println(period.isNegative());    }      // Driver Code    public static void main(String[] args)    {        int year = 12;        int months = 3;        int days = 31;          ifNegative(year, months, days);    }}

输出:

false

参考资料 : https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoPeriod.html#isNegative-

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