Role of native keyword

stay Thread Class Yes start0;
There is a class without a method body start0(), It's not supposed to be . It's used here native keyword .
native The function of keywords is ：

• Call the underlying code （ That is to say, when Thread Class start0 After method , The execution of the program is no longer subject to java Code control , Will call the underlying C++ Etc ）
• This keyword modifies the method and does not provide an implementation body , It goes into the local method stack , By calling JNI Interface implements the use of other language code and code base .
• There is a specially opened area in the memory ：Native Method Stack, registration Native Method .