*7 Must-Know Java Interview Questions* 💡 *1. What is the difference between JDK, JRE, and JVM?* ➡️ JVM runs Java bytecode, JRE includes JVM + libraries, and JDK includes JRE + development tools. *2. What are the main OOP concepts in Java?* ➡️ Encapsulation, Inheritance, Polymorphism, and Abstraction. *3. What is the difference between == and .equals()?* ➡️ `==` checks reference equality, `.equals()` checks content equality. *4. Explain the concept of constructor overloading.* ➡️ Multiple constructors in a class with different parameters to initialize objects differently. *5. What is the difference between ArrayList and LinkedList?* ➡️ ArrayList is faster for indexing, LinkedList is faster for insertion/deletion. *6. What are checked and unchecked exceptions?* ➡️ Checked: must be handled (e.g. IOException), Unchecked: runtime exceptions (e.g. NullPointerException). *7. Describe a Java project you built and the challenges you faced.* ➡️ Talk about technologies used, logic implemented, bugs fixed, and team collaboration. ✨ *Pro tip:* Always back up answers with real examples or code snippets. *Double Tap ❤️ if you found this useful!*