Round 1 - It included questions on data structures and algorithms, arrays, trees, and sorting concepts.

Round 2 - It was based on basic Core Java questions like overloading, collections, design patterns, custom objects, and types of Map.

Round 1:

1. Move all negative integers in the array to the left and all positive integers to the right, with zeros in between.
2. In a 2-dimensional matrix, find the minimum path starting from the first element to the last element.
3. Count the number of nodes at a particular level in a tree.

Round 2:

1. Overloading
2. Comparator and Comparable
3. Singleton Design Pattern: Write a program.
4. Immutable class other than String.
5. Design Patterns used.