计时周期是 Java 中的负()方法，示例
原文:https://www . geesforgeks . org/chronoperiod-is negative-method-in-Java-with-examples/
Java 中计时周期类的为负()方法用于检查周期中的 YEAR、MONTH、DAYS 三个是否为负。
语法:
boolean isNegative()
参数:该方法不接受任何参数。
返回值:如果给定期间的三值 YEARs、MONTHS、DAYS 中的任何一个为负，则该方法返回 True，否则返回 false。
下面的程序说明了 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
程序二 :
// 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:https://docs . Oracle . com/javase/9/docs/API/Java/time/chrono/chronoperiod . html # is negative–
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