How can u get the Length of a file u are going to download?

HI, 
I have another question, is it possible that u can get the length of a file which u are just going to download? 
 
I have the following code example: 
 url = new URL(dlfrom); 
f=new File(url.toURI()); 
System.out.println(f.length)(); 
unfortunatly it keeps throwing an exception, please help.

RTFM
http://java.sun.com/j2se/1.5.0/docs/api/java/net/URLCo
nnection.html#getContentLength() 
I tried to apply your sollution, but it is allways returning -1, so what should I do now, is there any possebility still to get the length of the object, because i thought of doing something similar as a tool to download stuff

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How can u get the Length of a file u are going to download?

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