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Tip: Taking Advantage of Immutable Objects in Java

Integer and Boolean are immutable; so, it is a bad idea to create objects that represent the same value, those classes have built-in caches for frequently used instances.


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zero = new Integer(0);
return Boolean.valueOf("true");

Integer and Boolean are immutable; so, it is a bad idea to create objects that represent the same value, those classes have built-in caches for frequently used instances. So, the programmer can take advantage of this:

zero = Integer.valueOf(0);
return Boolean.TRUE; 

 

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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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