What is "throw"

When casting an exception the normal control flow of a program is interrupted. If this happens within a block execution try, will continue within a block catch or finally, as in the following example of Java:

try {
     throw new RuntimeException ("para demonstrar try-throw-catch");
     System.out.println ("isso não é executado")
} catch (RuntimeException re) {
     System.out.println ("o fluxo de controle vai diretamente aqui");
}

Use Try-catch or Try-Finally for questions about the capture side of exception handling.

And about the complete process of treating exceptions use exception.

We have questions here that we can consider as canonical and reading them will learn a lot of what you need to solve your problem:

• What is the difference between "throw" and "throw ex"?