Java Period isNegative()方法及示例

Java中Period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

public 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、日三个数值中的任何一个为负值，则该方法返回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.Period;
import java.time.temporal.ChronoUnit;
  
public class PeriodDemo {
  
    // Function to check if any of the three 
    // YEAR, MONTH, DAY is negative
    static void ifNegative(int year, int months, int days)
    {
        Period 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.Period;
import java.time.temporal.ChronoUnit;
  
public class PeriodDemo {
  
    // Function to check if any of the three
    // YEAR, MONTH, DAY is negative
    static void ifNegative(int year, int months, int days)
    {
        Period 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);
    }
}