How do you extend the Java Exception class with a custom exception that takes a String parameter?

So I see you can extend the Exception class like so:

public FooException(Exception e)
{
    th开发者_JAVA百科is.initCause(e);
}

But what if you want to pass not an exception to FooException's constructor - but a String:

public FooException(String message)
{
    // what do i do here?
}

What would the body of the Constructor look like in that case?

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Exception also has a String constructor.

class FooException extends Exception {
    public FooException(String message) {
        super(message);
    }
}

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Erm ... that's not how you extend an exception. Create your own subclass which already takes a string as the argument.

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To extend a class you should do something like this:

public class FooException extends Exception {
    FooException(String message) {
         super(message);
    }
}