I received a call from HR, and they scheduled an interview for the next day. There were four technical rounds. The last round was both technical and managerial. They called me to their campus four times, once for each round.

Round 1: Java Basics, swap numbers without 2 temp variables, expression validation using stack.

Round 2: Application architecture, questions on matrix (sum of diagonals).

Round 3: BFS & DFS algorithms, matrix multiplication, sort a hashmap based on values.

Round 4: Managerial & Technical, explain Java concepts in real life, multi-threading, print numbers using 2 threads, REST WS.