java file.isfile_Java File isDirectory 、isFile 都返回false的问题

形如:

三级目录 A(Dir)-》B(Dir)-》C(File)

①File child = new File(children[i]);

无论File是目录还是文件,file.isDirectory() 、file.isFile() 都会返回false

②File child = new File(dir, children[i]);

传入父目录,就可以正确识别 child 的类型了。

=======================================

Demo: 只删除文件,不删除文件夹

private static boolean deleteDir(File dir) {

if (dir == null) {

return false;

}

if (dir.isDirectory()) {

String[] children = dir.list();

int len = children.length;

if (len == 0) {

return true;

}

for (int i = 0; i < len; i++) {

File child = new File(dir, children[i]);

boolean success;

if (child.isDirectory()) {

if (child.list().length == 0) {

return true;

}

success = deleteDir(child);

} else {

success = child.delete();

}

if (!success) {

return false;

}

if (i == len - 1) {

return true;

}

}

}

return dir.isDirectory();

}

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