Here you can find the source of formatId(String id)
public static String formatId(String id)
//package com.java2s; /*// w w w .j a v a 2s . c o m * Copyright 2012 Bo Zhu <zhu@xecurity.ca> * * 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. */ public class Main { public static String formatId(String id) { return String.format("%s-%s-%s-%s", id.substring(0, 4), id.substring(4, 8), id.substring(8, 12), id.substring(12, 16)); } }