Why is “throws Exception” necessary when calling a function?

Question

class throwseg1
{
    void show() throws Exception
    {
        throw new Exception(\"my.own.Exception\");
    }

    void show2() throws Exception  // Why throws i         


        

Answer 1

void show() throws Exception
{
    throw new Exception("my.own.Exception");
}

As there is checked exception in show() method , which is not being handled in that method so we use throws keyword for propagating the Exception.

void show2() throws Exception //Why throws is necessary here ?
{
show();
}

Since you are using the show() method in show2() method and you have propagated the exception atleast you should be handling here. If you are not handling the Exception here , then you are using throws keyword. So that is the reason for using throws keyword at the method signature.

Answer 2

If you propagate the exception by declaring the throws directive in the signature of the current method, then somewhere up the line or call stack a try/catch construct must be used to handle the exception.