What are java8 features? Why string is immutable? Difference between the checked exception and unchecked exception? Difference between throw and throws? Difference between inner class and anonymous class? Internal working of hashmap? Explain about dependency injection? What is polymorphism and types of polymorphism? Explain about access modifiers? Explain how spring will provided security?

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Answers to common Java Spring Boot Developer interview questions.

Java8 features include lambda expressions, functional interfaces, streams, and default methods.
String is immutable in Java to ensure thread safety and prevent unintended modifications.
Checked exceptions are checked at compile time, while unchecked exceptions are not. Example: IOException vs NullPointerException.
throw is used to explicitly throw an exception, while throws is used to declare that a method may throw an exception.
Inner classes are non-static nested classes, while anonymous classes are unnamed classes defined inline. Example: InnerClass vs new Interface() {...}.
HashMap internally uses an array of linked lists to store key-value pairs.
Dependency injection is a design pattern where objects are passed their dependencies rather than creating them internally.
Polymorphism allows objects of different classes to be treated as objects of a common superclass. Types include compile-time and runtime polymorphism.
Access modifiers control the visibility and accessibility of classes, methods, and variables. Examples: public, private, protected.
Spring provides security through features like authentication, authorization, and encryption.

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