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Tip: Testing for String Equality

See an example of the best way to check for string equality.


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if (name.compareTo("Jerry") == 0) ...
if (name == "Jerry") ...
if (name.equals("Jerry")) ...
if ("".equals(name)) ...

All the above comparisons are correct, but they are not great. The compareTo method is overkill and too diffuse. The == operator tests the object identity, which is not desirable. The equals method is OK, but reversing the constant and variable give you extra security if the name is null.

if ("Jerry".equals(name)) ...
if (name.length() == 0) ...
if (name.isEmpty()) ... 

 

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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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