持续时间类isZero()方法 (Duration Class isZero() method)

• isZero() method is available in java.time package.

  isZero()方法在java.time包中可用。

• isZero() method is used to check whether this Duration object holds the value of length is 0 or not.

  isZero()方法用于检查此Duration对象是否保持length的值为0。

• isZero() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  isZero()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• isZero() method does not throw an exception at the time of checking 0 lengths.

  在检查0个长度时， isZero()方法不会引发异常。

Syntax:

句法：

    public boolean isZero();

Parameter(s):

参数：

• None

  没有

Return value:

返回值：

The return type of this method is boolean, it returns true when this Duration value length is 0 otherwise it returns false.

此方法的返回类型为boolean ，当Duration值的长度为0时返回true，否则返回false。

Example:

例：

// Java program to demonstrate the example
// of boolean isZero() method of Duration
import java.time.*;
public class IsZeroOfDuration {public static void main(String args[]) {// Instantiates three Duration objects
Duration du1 = Duration.ofHours(-10);
Duration du2 = Duration.parse("P1DT2H20M");
Duration du3 = Duration.ofMinutes(0);
// Display du1, du2 and du3
System.out.println("du1: " + du1);
System.out.println("du2: " + du2);
System.out.println("du3: " + du3);
System.out.println();
// checks whether the value
// of this Duration (du1) is zero
// or not i.e here it returns false because
// the value of du1 is not 0
boolean status = du1.isZero();
// Display status
System.out.println("du1.isZero(): " + status);
// checks whether the value
// of this Duration (du2) is zero
// or not i.e here it returns false because
// the value of du2 is not 0
status = du2.isZero();
// Display status
System.out.println("du2.isZero(): " + status);
// checks whether the value
// of this Duration (du3) is zero
// or not i.e here it returns true because
// the value of du3 is 0
status = du3.isZero();
// Display status
System.out.println("du3.isZero(): " + status);
}
}

Output

输出量

du1: PT-10H
du2: PT26H20M
du3: PT0Sdu1.isZero(): false
du2.isZero(): false
du3.isZero(): true

翻译自: https://www.includehelp.com/java/duration-iszero-method-with-example.aspx