{@link #list()} method, except that the strings in the
* returned array must satisfy the filter. If the given
* filter is null then all names are epted.
* Otherwise, a name satisfies the filter if and only if the value
* true results when the {@link
* FilenameFilter#ept} method of the filter is invoked on this
* abstract pathname and the name of a file or directory in the directory
* that it denotes.
*
* @param filter A filename filter
*
* @return An array of strings naming the files and directories in the
* directory denoted by this abstract pathname that were epted
* by the given filter. The array will be empty if
* the directory is empty or if no names were epted by the
* filter. Returns null if this abstract pathname
* does not denote a directory, or if an I/O error urs.
*
* @throws SecurityException
* If a security manager exists and its {@link
* java.lang.SecurityManager#checkRead(java.lang.String)}
* method denies read ess to the directory
*/
public String[] list(FilenameFilter filter) {
String names[] = list();
if ((names == null) || (filter == null)) {
return names;
}
ArrayList v = new ArrayList();
for (int i = 0 ; i < names.length ; i++) {
if (ept(this, names[i])) {
v.add(names[i]);
}
}
return (String[])(v.toArray(new String[v.size()]));
}截取字符串用的
substring()方法有多个重载,参数各不同
上面substring(2);是截取从第三个字符开始到最后一个字符的字符串
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