Implementing parser with shift reduction in java

Question

I need to implement a shift analysis parser in my college, I need to know how I can implement it using java, are there any implementations already .... or any one

Answer 1

Are there any implementations already?

If the task is to actually practice writing it, I would recommend using a parser generator such as JavaCUP or ANTLR . (I used JavaCUP in one of my compiler courses, but maybe you have different features in your course.)