[英]list folders and sub folders in java
我一直在嘗試使用以下代碼在Java中顯示文件夾列表:
class Folder {
boolean isFile;
String folderName;
List<Folder> subFolders = new ArrayList<Folder>;
}
class ListF {
public static void main(String args[]) {
File fname = new File("C:/hello");
Folder obj = new Folder();
if (fname.isDirectory()) {
File[] fileNames;
fileNames = fname.listFiles();
for (i = 0; i < fileNames.length; i++) {
obj.subFolders.add(fileNames[i]);
}
System.out.println("The list is " + obj.subFolders);
}
}
}
但是我的代碼中出現錯誤:
ListF.java:5: '(' or '[' expected List<Folder> subFolders=new ArrayList<Folder>;
任何人都能指出我的錯誤嗎? 謝謝。
替換new ArrayList<Folder>;
by new ArrayList<Folder>();
List<Folder> subFolders = new ArrayList<Folder>;
將上述聲明作為:
List<Folder> subFolders = new ArrayList<Folder>();
要么
如果您使用的是Java 7及更高版本,那么您也可以這樣做....
List<Folder> subFolders = new ArrayList<>();
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