1、Copy the src.zip file in the jdk environment to the source file
2、Add the lib of the corresponding directory to the sdk
3、Happy to debugging
1、java.lang
2、java.util
3、java.util.concurrent
4、java.io
5、java.nio
6、java.lang.annotation
7、java.lang.reflect
8、java.util.function +java.util.stream
9、java.time
10、java.math
11、java.net
1、rm com.sun and sun package, Compilation may fail due to missing dependencies.