Q1. Given an array arr[] of size N, find the smallest and second smallest element in an array.

Q2. Min Path Sum from Top Left to Bottom Right

Q3. Diff between String, StringBuilder and StringBuffer
Q4. Why we need String in java if we have StringBuilder and StringBuffer
Q5. Diff between SingletonClass in Java and Spring
Q6. What to do when we need new bean each time not singleton object in spring ?