Obsolete Java Optimization Tips

Question

There are number of performance tips made obsolete by Java compiler and especially Profile-guided optimization. For example, these platform-provided optimizations can drasti

Answer 1

1. Don't manually call the garbage collector, it hurts performance on modern JVM implementations.
2. Integer instead of Long will not save much space, but will limit the range of the numbers.
3. Avoid hand generated Enum classes and use the built in Enum instead. Java 1.5 introduced real Enums, use them.