How java uses the local environment

This article will explain in detail how to use the local environment of java. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Use the local environment

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.

Here is a test case

/ / private static int a = 0; public static void main (String [] args) {int a = 0; long start = System.currentTimeMillis (); for (int I = 0; I < 1000000; iTunes +) {a = a + 1; System.out.println (I);} System.out.println (System.currentTimeMillis ()-start) }

The running result is obvious: using static variables takes time 15677ms, and using local variables takes time 13509ms. Thus it can be seen that the access speed of local variables is higher than that of member variables of the class.

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