java 顯示目錄檔案

public ArrayList getFileList() {
java.util.ArrayList array1 = new java.util.ArrayList();
try {
java.io.File folder = new java.io.File(".");
String[] list = folder.list();
for (int i = 0; i < list.length; i++) {
if (list[i].substring(list[i].length() - 3).equals("txt")) {
array1.add(list[i]);
System.out.println("File => " + list[i]);
}
}
} catch (Exception e) {
System.out.println("資料夾不存在");
}
return array1;
}