Re: 2 Newbie questions

Hi,

Christian wrote:
Hello

1. When I have an Class FooBar implementing the interfaces Foo and Bar

if some other class has the two methods
1. void doSomething(Foo foo) {}
2. void doSomething(Bar bar) {}

Which method will be called when I give an instance of FooBar as
parameter? Where is the best place to search for answers on such
questions maybe Language-Specifications?

I think, *here* is a good place. Or perhaps better in c.l.j.help.

The answer is: You will get a compiler-error, when trying doSomething(new FooBar()). Note that doSomething((Foo)new FooBar()) should be possible, because the 'static type' (of the reference) is important, and not the 'dynamic type' (of the referenced Object).

2. If I write a program that is made for opening some filetype, and I
wan't only one instance of my program to be open i.e. open some tab in
running instance myself when the user doubleclicks on a file ...

Is there some easy solution to do this in java or do I need to create
for example a tcp connection to my running instance and tell it the file
parameter that way?

No, a ServerSocket is the best solution. A lock-File is another solution but has obvious disadvantages.

Hth,
Ingo

.

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