java 13 interview questions and answers

: Final can be applied to classes, methods and variables and the features cannot be changed. Final class cannot be subclassed, methods cannot be overridden. In Java, the final modifier is used to apply restrictions on classes, methods, and variables. Here’s a brief explanation of its usage in different contexts: Final Variables: When applied to … Read more

Yes it is perfectly legal. In Java, when a subclass overrides a method from its superclass, it must adhere to certain rules regarding the exceptions it throws. The overriding method in the subclass cannot throw checked exceptions that are broader than the ones thrown by the overridden method in the superclass. However, it is allowed … Read more

  : You can provide a try/catch block to handle it. OR Make sure method declaration includes a throws clause that informs the calling method an exception might be thrown from this particular method When you extend a class and override a method, can this new method throw exceptions other than those that were declared … Read more

Errors are usually compile time and exceptions can be runtime or checked. In Java, both exceptions and errors are types of throwable objects, but they serve different purposes and are used in different contexts. Here are the main differences between exceptions and errors: Nature of the Problem: Exception: Exceptions are abnormal conditions that occur during … Read more

Runtime exceptions are due to programming bugs like out of bond arrays or null pointer exceptions. In Java, runtime exceptions are exceptions that occur during the execution of a program. Unlike checked exceptions, which the compiler requires you to handle or declare, runtime exceptions are unchecked, meaning that the compiler does not enforce any handling … Read more