Here you can find the source of filename(String prefix, String sep, String index)
public static String filename(String prefix, String sep, String index)
//package com.java2s; /*// w w w. j a v a 2 s .c o m * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. */ public class Main { /** Construct a filename */ public static String filename(String prefix, String sep, int N) { return String.format("%s%s%04d", prefix, sep, N); } /** Construct a filename */ public static String filename(String prefix, String sep, String index) { return String.format("%s%s%s", prefix, sep, index); } }