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Java Period isNegative()用法及代码示例


Java中的Period类的isNegative()方法用于检查period中的三个YEAR,MONTH,DAYS中的任何一个是否为负。

用法:

public boolean isNegative()

参数:此方法不接受任何参数。


返回值:如果给定时间段的三个YEAR,MONTHS,DAYS中的任何一个为负,则此方法返回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); 
    } 
}
输出:
false

参考: https://docs.oracle.com/javase/8/docs/api/java/time/Period.html#isNegative–



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注:本文由纯净天空筛选整理自barykrg大神的英文原创作品 Period isNegative() method in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。