Q. What is the difference between Singleton and Immutable object
Java Software Engineer Interviews
Java Software Engineer Interview Questions
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How do you nullify or remove the unused objects from memeory?
what is the output public class Barclays { static class A{ A(){ f(); } public void f(){ System.out.println("A ctor"); } } static class B extends A{ B(){ f(); } public void f(){ System.out.println("B ctor"); } } public static void main(String[] args) { B b = new B(); b.f(); A a = new A(); a.f(); } }
Write a method to remove even numbers from list without using any other collection.
1. Implement Comparable Interface? 2. Write a Employee class and sort its properties age and Emp name? 3. How actually hashmap works in Java? 4. How the size of ArrayList grows dynamically?
How concurrent Hashmap works ?
Yeah, it is not thread safe, you can call it just a certain number of times, what would you do? There is some feature in the language, but I'm trying to see what you think.
Program : find duplicate string from list
What is the difference between String Builder and String Buffer
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