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2 Eliminate simple methods such as accessor method 3 Myths 4 External link |
However, the Java HotSpot VM, introduced in J2SE 1.3, supports method inlining. Any code sections recognized as "hotspots" by this VM will be optimized including inlining of method calls, where it can be done safely.
Reduce number of object creations
In Java, object creations are so expensive compared with other compiled object-oriented programming language. It is because in Java, object creation involves:
Eliminate simple methods such as accessor method
Since the Java compiler cannot be completely sure about which method will be called before runtime due to dynamic class loading, each method call involves looking up a method. Use of small and simple methods that are called frequently can be quite expensive. If possible, embed code of such method directly to the point of call.Myths
There are some myths in performance tuning of Java programs.final modifer with methods or classes reduces the overhead of call of methods - Because the Java compiler cannot know which class will be loaded at runtime, it cannot in-line-expand the methods regardless if they have final or not.External link