Write Singleton classes Write Rest API Find the repeating character in a string. Variables are inherited or not. Exception Handling Spring AOP Exception handling Completables future

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Answering questions related to Singleton classes, Rest API, repeating characters in a string, variable inheritance, and exception handling.

Singleton classes are used to ensure that only one instance of a class is created and provide a global point of access to it.
Rest API is a way of building web services that are lightweight, scalable, and maintainable.
To find the repeating character in a string, we can use a hashmap to store the frequency of each character and then iterate through the string to find the first character with a frequency greater than 1.
Variables are not inherited in Java, but they can be accessed through inheritance using methods.
Exception handling is a way of handling errors and exceptions that occur during program execution.
Spring AOP Exception handling is a way of handling exceptions in Spring applications using Aspect-Oriented Programming.
CompletableFutures are a way of performing asynchronous operations in Java and can be used to chain together multiple asynchronous operations.

Write Singleton classes Write Rest API Find the repeating character in a string. Variables are inherited or not. Exception Handling Spring AOP Exception handling Completables future

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