What is the difference between JDK and JRE?

What is the difference between an interface and an abstract class?

What is a classloader in Java?

What is the difference between checked and unchecked exceptions?

What is the difference between a String, StringBuilder, and StringBuffer?

What is the difference between a static and non-static method?

What is a constructor in Java?

What is method overloading and method overriding?

What is the difference between a stack and a queue?

What is an annotation in Java?

What is the difference between an ArrayList and a LinkedList?

What is the difference between a Hashtable and a HashMap?

What is the difference between a Set and a List?

What is the difference between a binary tree and a binary search tree?

What is an inner class in Java?

What is the difference between a private and a protected method?

What is the difference between a static and non-static variable?

What is the difference between a try-catch block and a finally block?

What is the difference between the equals() and == operators in Java?

What is the purpose of the final keyword in Java?

What is the difference between a while loop and a do-while loop?

What is the difference between a break and a continue statement?

What is polymorphism in Java?

What is a package in Java?

What is the difference between an abstract method and a concrete method?

What is the purpose of the super keyword in Java?

What is a static initializer block in Java?

What is the purpose of the synchronized keyword in Java?

What is a lambda expression in Java?

What is the difference between an instance variable and a class variable?

What is the difference between a public and a private class?

What is the difference between an interface and a class?

What is the difference between a static and non-static class?

What is the purpose of the finalize() method in Java?

What is the difference between a stack trace and a heap dump?

What is the purpose of the transient keyword in Java?

What is a thread in Java?

What is the difference between a daemon thread and a user thread?

What is the difference between a synchronized method and a synchronized block?

What is the purpose of the volatile keyword in Java?

What is the difference between a semicolon and a colon in Java?

What is the difference between a public and a private constructor?

What is the purpose of the extends keyword in Java?

What is the purpose of the implements keyword in Java?

What is the difference between a static and non-static initializer block?

What is the difference between a class and an object?

What is the difference between an instance method and a class method?

What is the difference between a factory method and a constructor?

What is the purpose of the instance of operator in Java?

What is the purpose of the this keyword in Java?