This Optimization of Java is a collection of optimization techniques used in Java programming language.
There are some myths in performance tuning of Java programs.
Reduce a 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
Because Java compiler cannot be completely sure about which method will be called before runtime, 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 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.