Here you can find the source of fill(char[] chars, int fromIndex, int toIndex, char c)
public static char[] fill(char[] chars, int fromIndex, int toIndex, char c)
//package com.java2s; /*/*from www . j av a 2 s. c o m*/ * (c) Copyright 2007-2012 by Volker Bergmann. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, is permitted under the terms of the * GNU General Public License. * * For redistributing this software or a derivative work under a license other * than the GPL-compatible Free Software License as defined by the Free * Software Foundation or approved by OSI, you must first obtain a commercial * license to this software product from Volker Bergmann. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS, * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ import java.util.*; public class Main { private static char[] WHITESPACE_BUFFER; public static char[] fill(char[] chars, int fromIndex, int toIndex, char c) { int length = toIndex - fromIndex; if (length < 20) { for (int i = fromIndex; i < toIndex; i++) chars[i] = c; } else if (c != ' ' || length > WHITESPACE_BUFFER.length) { Arrays.fill(chars, fromIndex, toIndex, c); } else { System.arraycopy(WHITESPACE_BUFFER, 0, chars, fromIndex, length); } return chars; } }