Coding Interview Resources

What is the use of Destructor in Java? What is a Destructor? A destructor is a special method that gets called automatically as soon as the life-cycle of an object is finished. A destructor is called to de-allocate and free memory. The following tasks get executed when a destructor is called. - Releasing the release locks - Closing all the database connections or files - Releasing all the network resources - Other Housekeeping tasks - Recovering the heap space allocated during the lifetime of an object Destructors in Java also known as finalizers are non-deterministic. The allocation and release of memory are implicitly handled by the garbage collector in Java. Finalizers in Java have to be implicitly invoked since their invocation is not guaranteed, unlike C# finalizers which get invoked during the .NET run-time. Let’s take a look at key properties of a destructor: - Overloading or inheritance is not allowed - No specification of access modifiers or parameters - Automatic invocation and no explicit call from the user - Used in classes but not in structures - The order of the class varies from the most derived class to the least derived class - Also called when the object instance is no longer eligible for access - Used for releasing un-managed resources instead of managed resources held by the object Garbage Collector A garbage collector is a program that runs on the Java virtual machine to recover the memory by deleting the objects which are no longer in use or have finished their life-cycle. An object is said to be eligible for garbage collection if and only if the object is unreachable.

🔰 Python for Machine Learning & Data Science Masterclass ⏱ 44 Hours 📦 170 Lessons Learn about Data Science and Machine Learning with Python! Including Numpy, Pandas, Matplotlib, Scikit-Learn and more! Taught By: Jose Portilla Download Full Course: https://t.me/datasciencefree/69 Download All Courses: https://t.me/datasciencefree/2

🔰 Python for Machine Learning & Data Science Masterclass ⏱ 44 Hours 📦 170 Lessons Learn about Data Science and Machine Learning with Python! Including Numpy, Pandas, Matplotlib, Scikit-Learn and more! Taught By: Jose Portilla Download Full Course: https://t.me/datasciencefree Download All Courses: https://t.me/datasciencefree/2

   How to make 954% profit doing practically nothing? Just. Invest. In stocks. Sounds unreal? Let us show you an example.     Tesla stock price was $95 in 2020. Now, it is worth $1002, and it is far from its peaks. If you invested in Tesla stock 2 years ago, right now you would be 10 times more rich. Just imagine you invest $1000 and get $10547 profit. Very tempting, isn't it?    Trust us, there are hundreds more ways to build your wealth on the market. Stocks, currencies, commodities, crypto…. This is a world of opportunity. But you have to be informed.     But where to get all of the profitable information on the markets?     👉Subscribe to the Pro Trader Academy channel to always be aware of what moves the global markets and stop missing chances that they are giving you.

Top 9 websites for practicing algorithms and Data structure. ⛓ https://www.hackerrank.com/ ⛓ https://leetcode.com/ ⛓ https://www.codewars.com/ ⛓ https://www.hackerearth.com/for-developers ⛓ https://coderbyte.com/ ⛓ https://www.coursera.org/browse/computer-science/algorithms ⛓ https://www.codechef.com/ ⛓ https://codeforces.com/ ⛓ https://www.geeksforgeeks.org/

🕯 Sites to practice programming and solve challenges to improve programming skills 🕯 1️⃣ https://edabit.com 2️⃣ https://codeforces.com 3️⃣ https://www.codechef.com 4️⃣ https://leetcode.com 5️⃣ https://www.codewars.com 6️⃣ http://www.pythonchallenge.com 7️⃣ https://coderbyte.com 8️⃣ https://www.codingame.com/start 9️⃣ https://www.freecodecamp.org/learn ENJOY LEARNING 👍👍

Programming Android with Kotlin Author: Pierre-Olivier Laurence, Amanda Hinchman-Dominguez, G. Blake Meike, Mike Dunn Year: 2021

Typical java interview questions sorted by experience Junior * Name some of the characteristics of OO programming languages * What are the access modifiers you know? What does each one do? * What is the difference between overriding and overloading a method in Java? * What’s the difference between an Interface and an abstract class? * Can an Interface extend another Interface? * What does the static word mean in Java? * Can a static method be overridden in Java? * What is Polymorphism? What about Inheritance? * Can a constructor be inherited? * Do objects get passed by reference or value in Java? Elaborate on that. * What’s the difference between using == and .equals on a string? * What is the hashCode() and equals() used for? * What does the interface Serializable do? What about Parcelable in Android? * Why are Array and ArrayList different? When would you use each? * What’s the difference between an Integer and int? * What is a ThreadPool? Is it better than using several “simple” threads? * What the difference between local, instance and class variables? Mid * What is reflection? * What is dependency injection? Can you name a few libraries? (Have you used any?) * What are strong, soft and weak references in Java? * What does the keyword synchronized mean? * Can you have “memory leaks” on Java? * Do you need to set references to null on Java/Android? * What does it means to say that a String is immutable? * What are transient and volatile modifiers? * What is the finalize() method? * How does the try{} finally{} works? * What is the difference between instantiation and initialisation of an object? * When is a static block run? * Why are Generics are used in Java? * Can you mention the design patterns you know? Which of those do you normally use? * Can you mention some types of testing you know? Senior * How does Integer.parseInt() works? * Do you know what is the “double check locking” problem? * Do you know the difference between StringBuffer and StringBuilder? * How is a StringBuilder implemented to avoid the immutable string allocation problem? * What does Class.forName method do? * What is Autoboxing and Unboxing? * What’s the difference between an Enumeration and an Iterator? * What is the difference between fail-fast and fail safe in Java? * What is PermGen in Java? * What is a Java priority queue? * *s performance influenced by using the same number in different types: Int, Double and Float? * What is the Java Heap? * What is daemon thread? * Can a dead thread be restarted? Source: medium.

PrepBytes Marathon Challenge is a 10 DAY monthly competitive coding contest by PrepBytes. 👇👇 https://bit.ly/3LDJJMn 1. Top 5 will receive paid internship offers and recognition certificates from PrepBytes. 2. Winners will be decided by the PrepBytes team after checking all the submissions Date: 9th April 2022 (10days) Link: https://bit.ly/3LDJJMn

Typical java interview questions sorted by experience Junior * Name some of the characteristics of OO programming languages * What are the access modifiers you know? What does each one do? * What is the difference between overriding and overloading a method in Java? * What’s the difference between an Interface and an abstract class? * Can an Interface extend another Interface? * What does the static word mean in Java? * Can a static method be overridden in Java? * What is Polymorphism? What about Inheritance? * Can a constructor be inherited? * Do objects get passed by reference or value in Java? Elaborate on that. * What’s the difference between using == and .equals on a string? * What is the hashCode() and equals() used for? * What does the interface Serializable do? What about Parcelable in Android? * Why are Array and ArrayList different? When would you use each? * What’s the difference between an Integer and int? * What is a ThreadPool? Is it better than using several “simple” threads? * What the difference between local, instance and class variables? Mid * What is reflection? * What is dependency injection? Can you name a few libraries? (Have you used any?) * What are strong, soft and weak references in Java? * What does the keyword synchronized mean? * Can you have “memory leaks” on Java? * Do you need to set references to null on Java/Android? * What does it means to say that a String is immutable? * What are transient and volatile modifiers? * What is the finalize() method? * How does the try{} finally{} works? * What is the difference between instantiation and initialisation of an object? * When is a static block run? * Why are Generics are used in Java? * Can you mention the design patterns you know? Which of those do you normally use? * Can you mention some types of testing you know? Senior * How does Integer.parseInt() works? * Do you know what is the “double check locking” problem? * Do you know the difference between StringBuffer and StringBuilder? * How is a StringBuilder implemented to avoid the immutable string allocation problem? * What does Class.forName method do? * What is Autoboxing and Unboxing? * What’s the difference between an Enumeration and an Iterator? * What is the difference between fail-fast and fail safe in Java? * What is PermGen in Java? * What is a Java priority queue? * *s performance influenced by using the same number in different types: Int, Double and Float? * What is the Java Heap? * What is daemon thread? * Can a dead thread be restarted? Source: medium.

8 Best Note-Taking Apps for Programmers 📜 Notion 📜 CoderNotes 📜 Quiver 📜 MedleyText 📜 Boostnote 📜 Stackedit 📜 Evernote 📜 Microsoft onenote

How long are coding interviews? The phone screen portion of the coding interview typically lasts up to one hour. The second, more technical part of the interview can take multiple hours. Where can I practice coding? There are many ways to practice coding and prepare for your coding interview. LeetCode provides practice opportunities in more than 14 languages and more than 1,500 sample problems. Applicants can also practice their coding skills and interview prep with HackerRank. How do I know if my coding interview went well? There are a variety of indicators that your coding interview went well. These may include going over the allotted time, being introduced to additional team members, and receiving a quick response to your thank you email.