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This article mainly explains "what are the characteristics that affect performance in Java programming?" the content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the characteristics that affect performance in Java programming?"

1. Use final modifiers whenever possible.

Classes with final modifiers are not derivable. In the core API of Java, there are many examples of using final, such as java.lang.String. Specifying final for the String class prevents the consumer from overriding the length () method. In addition, if a class is final, then all methods of that class are final. The java compiler will look for opportunities to inline (inline) all final methods (this is related to the specific compiler implementation). This can improve performance by an average of 50%.

two。 Reuse objects as much as possible.

Especially in the use of String objects, StringBuffer should be used instead of string concatenation, because the system not only takes time to generate objects, but may also take time to garbage collect and dispose of these objects in the future. So generating too many objects will have a great impact on the performance of the program.

3. Try to use local variables.

The parameters passed when the method is called and the temporary variables created in the call are stored in the Stack, which is faster. Other variables, such as static variables, instance variables, and so on, are created in the Heap and are slow.

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