core java in java questions asked in companies

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

Checked exceptions are exceptions that arise in a correct program, typically due to user mistakes like entering wrong data or I/O problems. In Java, checked exceptions are exceptions that are checked at compile-time. This means that the compiler enforces certain rules regarding handling these exceptions. If a method can potentially throw a checked exception, the … Read more

This indicates that the method throws some exception and the caller method should take care of handling it. In Core Java, the throws clause in a method declaration is used to indicate that the method may throw one or more specified exceptions during its execution. When a method is declared with a throws clause, it … Read more

The death of thread – Use of system.exit() – Turning off the power to CPU – An exception arising in the finally block itself Rules for catching multiple exceptions – A more specific catch block must precede a more general one in the source, else it gives compilation error – Only one catch block, that … Read more