File io command to list dir with wildcards

[grodysk]

The below code gives a NullPointerException when i try to include wildcards on the File command. If i leave off the \\*.zip it will work fine. How can i filter this command?

import java.io.*;
...
String dir = "C:\\parentdir\\subdir\\*.zip";
...
// Get list of files in a give directory
File fname = new File(dir);
String[] file_list = fname.list();

[grodysk]

"I" figured it out...

import java.io.*;

public class DirList {
public static void main(String[] args) {
try {
File path = new File(".");
String[] list;
if(args.length == 0)
list = path.list();
else
list = path.list(new DirFilter(args[0]));
for(int i = 0; i < list.length; i++)
System.out.println(list[i]);
} catch(Exception e) {
e.printStackTrace();
}
}
}

class DirFilter implements FilenameFilter {
String afn;
DirFilter(String afn) { this.afn = afn; }
public boolean accept(File dir, String name) {
// Strip path information:
String f = new File(name).getName();
return f.indexOf(afn) != -1;
}
}

[xylex_blaiste]

yep you won't get anyting if you use *. you could use the endsWith() method since you are manipulating strings to get specific types of files. or you could use the pattern class in jdk1.4++. i haven't used this yet, but supposedly it handles wildcards. your solution is fine.