Here you can find the source of leftZeroPad(String s)
public static String leftZeroPad(String s)
//package com.java2s; /**/* www. j av a 2 s.c om*/ * Marmoset: a student project snapshot, submission, testing and code review * system developed by the Univ. of Maryland, College Park * * Developed as part of Jaime Spacco's Ph.D. thesis work, continuing effort led * by William Pugh. See http://marmoset.cs.umd.edu/ * * Copyright 2005 - 2011, Univ. of Maryland * * 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 leftZeroPad(String s) { if (s.length() < 16) { String padding = "0000000000000000".substring(0, 16 - s.length()); s = padding + s; } if (s.length() != 16) throw new IllegalStateException("Generated result of '" + s + "'"); return s; } }