I want to find out previous year placement paper related to java by which i can prepare for placement
My suggestion is to first clear your basics of C, data structure the go for oops concept.
300 Core Java Interview Questions | OOPs interview questions - javatpoint
These websites provide all types of questions of JAVA which helps you in preparation for placement.
They can be your rescuer/saviour for any possible computer science thing for any of your needs in the world! Another link of the same