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Funge funge..che errore ti da?
Prova il codice cosi...codice:import java.io.*; class Filtro implements FileFilter { public boolean accept(File pathname) { return pathname.getName().toLowerCase().endsWith(".txt"); } } public class Prova{ public static void main(String[] args){ File dir = new File("C:\\"); File[] f = dir.listFiles(new Filtro()); for(int i=0;i<f.length;i++){ System.out.println(f[i].getName()); } } }