basic questions based on requirement only they will take
Java Lead Interview Questions
18,805 java lead interview questions shared by candidates
Spring related questions like DI,IOC,etc.
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Different types of joins in SQL
Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the correct order. Every close bracket has a corresponding open bracket of the same type. Example 1: Input: s = "()" Output: true Example 2: Input: s = "()[]{}" Output: true Example 3: Input: s = "(]" Output: false Example 4: Input: s = "([])" Output: true Given an array of size N filled with numbers from 1 to N-1 in random order. The array has only one repetitive element. The task is to find the repetitive element. Examples: Input: a[] = {1, 3, 2, 3, 4} Output: 3 Explanation: The number 3 is the only repeating element. Input: a[] = {1, 5, 1, 2, 3, 4} Output: 1 Brute Force To Optimization
Hasmap internal working with hascode() and equals() implementation in custom class
How do hashmap work? How do concurrenthashmap work?
What is Abstraction? And what is the difference between Abstract Class and an Interface?
abstract class, inheritance
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