JVM
JVM is the foundation and core java, java virtual processors between the compiler and os platform. It is the bytecode program utilizing software-implemented method of computer-based abstraction of the underlying operating system and hardware platform can be performed in the above java.
java compiler for as long as the JVM, builds JVM code or byte code files can be appreciated. Java source files compiled into bytecode program, each instruction by the JVM will translate into machine code on different platforms, run by a particular platform.
The following information is what I use spare time took almost a month to sort out, is collected from Baidu, as well as major IT forum above, sorting, and here I will share this information out, may need to add about three thousand people exchanges 860 113 481 discussion groups, document sharing as a free, old saying: study alone without friends, the ignorant, learn together and progress together!
optimization
In short, the system is running without affecting the validity of the premise, to make it run faster, time required to complete a specific function shorter.
More do not show up, we need to add about three thousand people can exchange 860 113 481 discussion groups receive free!