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Tip: How to Check if Index Is in Range [0, n)

See how to use the  bjects.checkIndex() method to check if the given index is in range [0, n) in Java 9


In order to check whether or not an index is in range [0, n) we can rely on a "if" statement, as below:

if (index = n) { ... }

But, Java 9 comes with the method bjects.checkIndex() that checks if the given index is in range [0, n).

This method returns the given index or throws an IndexOutOfBoundsException:

import java.util.Objects;
int indexChecked = Objects.checkIndex(index, n);


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Octavia Andreea Anghel is a senior PHP developer currently working as a primary trainer for programming teams that participate at national and international software-development contests. She consults on developing educational projects at a national level. She is a coauthor of the book "XML Technologies--XML in Java" (Albastra, ISBN 978-973-650-210-1), for which she wrote the XML portions. In addition to PHP and XML, she's interested in software architecture, web services, UML, and high-performance unit tests.
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