Java ChronoPeriod isNegative()方法及实例
Java中 ChronoPeriod类 的 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-
