Why would we manually throw an exception?

Why would we manually throw an exception?

When an exception is to be handled which are not java class library, a user defined exception can be thrown. An exception can be thrown explicitly, when a condition is met. In other words, in a situation where an exception is predicted by the developers, then it can be explicitly thrown. The key word ‘throw’ is used followed by the object of the exception and it accepts only one parameter.
What is chained exceptions in java?
Once an application finds an exception, responds an exception by throwing another exception. It causes another exception. Knowing an exception that causes another exception is very useful...
When should we create our own custom exception classes? - Java
The term exception lets the programmer to know that there is something exceptional has occurred in the program. Apart from Java exception class library, a custom exception can be created by the developer...
What are primitive type wrappers classes? - Java
Primitive type wrapper classes or simply wrapper classes are available in java.lang package for providing object methods for all the eight primitive types. All the wrapper class objects are immutable...
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