Here you can find the source of leftPad(String s, int n)
public static String leftPad(String s, int n)
//package com.java2s; /*//from w w w . j a va 2 s. c o m * Copyright (c) 2008, 2009, 2010, 2011 Denis Tulskiy * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * version 3 along with this work. If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static String leftPad(String s, int n) { return String.format("%1$#" + n + "s", s); } }