Java find jar file name from multiple set of jar files

import java.io.*;
import java.util.*;
class OnlyExt implements FilenameFilter{
  String ext;
  public OnlyExt(String ext){
  this.ext="." + ext;
  }
  public boolean accept(File dir,String name){
  return name.endsWith(ext);
  }
}
class  FindJar
{
    public static void main(String[] args) 
    {
        ArrayList list=new ArrayList();
        FilenameFilter ff = new OnlyExt("jar");
        File folder = new File("C:/");
        File[] files = folder.listFiles(ff);
        for(int i=0;i<files.length;i++){
            list.add(files[i].getName());
        }
        if(list.contains("examples.jar")){
          System.out.println("Jar file exist");
        }
        else{
          System.out.println("Jar file does not exist");
        }   
    }
}