scjp5.0 question

[nikunj thakur]

class Alien {
String invade(short ships) { return "a few"; }
String invade(short... ships) { return "many"; }
}
class Defender {
public static void main(String [] args) {
System.out.println(new Alien().invade(7));
}
}

What is the result?

many

a few

Compilation fails.

The output is not predictable.

An exception is thrown at runtime.

the answer is compilation fails
but why do we have to cast the invade(7) to short

[Mohit Jain]

During method call 'invade(7)' must be cast to 'short' because while parameter passing no implicit type conversion occurs.

here 7 is an 'int' type and invade(7) is read by compiler as 'invade(int)'.

So passing an 'int' arguement to a 'short' variable cannot have implicit type conversion. Explicit cast is a must.
[ November 21, 2007: Message edited by: Mohit Jain ]

[Kelvin Chenhao Lim]

Hi Nikunj,

I believe you posted the exact same question a few days ago. You may wish to check the replies in that thread:

https://coderanch.com/t/266326/java-programmer-SCJP/certification/help-scjp

Also, please note Bert's request that you quote your sources. Thanks.
[ November 21, 2007: Message edited by: Kelvin Lim ]