implementation of shift reduce parser in java

Question

i need to implement the shift reduce parser in my college ,i need to know how can i implement it using java is there is any implementations already .... or any sample one

Answer 1

is there any implementations already?

Unless the task is to actually practice writing it yourself, I'd recommend using a parser generator such as JavaCUP or ANTLR. (I used JavaCUP in one of my compiler courses, but perhaps you have a different scope in your course.)