Implement inline functions in Java

Whether C ++ is an inline function is determined by yourself, and Java is determined by the compiler.

Java does not support direct declaration as an inline function. If you want to enable inline function, the compiler determines that you can only request the compiler.

In addition to being override, final may also be inline.

If the function is private, it may also be inline.

Generally, a function is not considered as an inline function. The compiler will consider whether to convert your function into an inline function only after final is declared.