Core Java, memory model, classloaders, design patterns etc
Lead Java Developer Interview Questions
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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
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.
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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.
1. Solid principles 2. Singleton pattern, in case if we pass hashmap- map can be altered and it will destroy singleton, how to handle that 3. How to create threads 4. How to execute 10 threads at a time 5. How to create global exception class 6. When to use arraylist and linkedlist 7. Completable in java 8 8. What's changed in hashmap in java 8 9. Deep copying and shallow copying 10. Use of volatile keyword in java 11. Programming a. String ="I love programming" -we need to count the length and arrange it in desc but that should be return as string using stream api b. List in = Arrays.asList(1,3,7,0,6,7,8,0); need to sort this and put only 0 at first and let the remaining stay as it is using stream API
very basic java question
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