Here you can find the source of leftPad(String s, int length)
public static String leftPad(String s, int length)
//package com.java2s; /**/* w w w . ja va 2s . c o m*/ * Copyright 2009 Red Hat, Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ public class Main { public static String leftPad(String s, int length) { if (s == null) s = ""; if (s.length() > length) return s.substring(0, length); return repeat(" ", length - s.length()) + s; } public static String repeat(String s, int length) { StringBuilder sb = new StringBuilder(); for (int i = 0; i < length; i++) sb.append(s); return sb.toString(); } }