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Tip: Converting Numbers to Strings

Learn the right way to convert numbers to Strings.


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"" + set.size()
new Integer(set.size()).toString()

The return type of the Set.size() method is int, but it is desired a conversion to String. These two lines do the conversion, but the first use the penalty of a concatenation operation ((new StringBuilder().append(i).toString())) and the second one creates an intermediate Integer wrapper. So, the right way to convert numbers to Strings is:

Integer.toString(set.size())

 

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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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