Java tutorial
//package com.java2s; /** * Copyright 2008 - 2009 * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. * * @project loonframework * @author chenpeng * @emailceponline@yahoo.com.cn * @version 0.1 */ import java.io.File; public class Main { public static String toFileType(File file) { return toTypePart(file.getName()); } public static String toTypePart(String fileName) { int point = fileName.lastIndexOf('.'); int length = fileName.length(); return (point == -1 || point == length - 1) ? "" : fileName.substring(point + 1, length); } public static String getName(String name, String ext) { return (name + "." + ext).intern(); } }