Domanda di colloquio di Oracle

Round 1 : Q1 - Difference between List and Set in Java Q2 - Hashtable and its implentation in Java Q3 - Collisions in Hashtable Q4 - OOPs concepts questions like Polymorphism, Abstraction and Encapsulation Q5 - One coding question related to 0/1 knapsack Round 2 : Q1 - Internships and projects which I had done Q2 - Difference between class and instance variable in Java Q3 - Write code for implementing FIFO queue using ArrayList in Java Q4 - DFS coding question (Number of islands that can be formed with a given matrix of 0's and 1's). Its a famous LeetCode DFS question