用java实现的堆栈结构，可以实现编译原理课程的构造文法分析器的功能-Realization of java stack structure, structure grammar parser compiler theory courses

java链表操作：查找、删除和插入。 自己写的，编译已经通过-java linked list operations:search, delete and insert. Write it by my own, the compiler has passed.