Kaleidofin Software Engineer, Backend interview questions

Part 1: Java, Spring Boot, and Database part. Q1 - Define Thread Lifecycle. Q2 - Difference between equals() and ==. Q3 - Can we override static methods? Q4 - Difference between Primary key and Unique key in MySQL. Q5 - Can we enter null values in multiple unique key columns? Q6 - Define the internal working of Indexing in MySQL. Q7 - Code scenarios with static methods.