Give you an example: the use of filefilter interfaces.

Original question:
How to check if the server c:\ have test.jpg this file (do not know the extension)



===================


First, define an instance of FileFilter


private static FileFilter filefilter=new FileFilter () {


public Boolean accept (File pathname) {


String tmp=pathname.getname (). toLowerCase ();


if (Tmp.endswith (". Jar") | | | tmp.endswith (". zip")) {


return true;


            }


return false;


        }


};


This is an example of my writing, as long as the extension is a jar or a zip to meet the criteria, you can change to Tmp.startwith ("Test.") Sort of. You can also make more judgments and use regular expressions as well.





Then:


file Root=new file ("c:\\");


file[] Files=root.listfiles (filefilter);


this time, judge the size and content of files to know if there is any file you want in the C:\ directory.