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Java Lead Interview Questions
601 java lead interview questions shared by candidates
Questionnaire sur https://www.codingame.com (questions sur l'orientée objet, Java, Spring, SQL, Javascript, Linux et sécurité)
Ques : Write a pgm for prime numbers , and find a dupplicate numbers in a sorted list. Ques : Write a immutable object with date object . Ques : What is reentrant lock? Ques :Coding question asked to do in second round: Below are the given coordinates of points on graph .{1,0},{2,0},{3,0},{-1,0},{0,2},{-2,0} Find all the points that are at second farthest distance from center i.e. {0,0} ? Answer for above input {0,2},{2,0},{-2,0} Formula to get distance from center is d2=x2+y2
Core Java, memory model, classloaders, design patterns etc
find an element in the aray and if it is not found , return the element just greater than the element we are trying to search.
1st Technical consist of question like:- 1.) Design pattern- GOF, Singleton, Builder, Factory ect. 2.) A simple java program used for sorting. 3.) Aggregation vs Composition 4.) Core java questions-- String pool, prepared statement, heap, Maps, Hashing. etc. Both Client Round was scenario based and only Multi Threading was asked:- It was tough for me as i had never worked on multi threading. Was of same level.
3rd Question was from Java Collections. Given a List of Object, which can contain Integers and also contain List which internally can again contain List to nth Level. Write a utility method which would return a flat List.
Phone Interview: What needs to be overriden to make an object a key in hashmap? Give me some examples of Lists? Give me some examples of Sets. Explain how a Map works Tell me some access modifiers. What is needed to make an object a Key apart from overriding equals and hashcode. What is a property of a primitive Tell me some properties of a String Explain how an Arraylist works Abstract vs Inheritance What does a class need to let it be run as a thread How do you create a thread When is finally used / what is it? What is a synchronised block What are checked and unchecked exceptions. Why is an ArrayList faster than a Linked List First round in person Maths: Worked out general rule based on given paramaters Code: Simple Java problems (palindrome, output value when number is a multiple, etc. look in a java interview book, cracking the coding interview is good) Riddle: Worst part, again will be something in the cracking the coding interview book. Second round. Much like the first + HR bit.
Design patterns you used and scenario?
runtime polymorphism
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