Here you can find the source of copyOf(char[] source)
public static char[] copyOf(char[] source)
//package com.java2s; /*/*from w w w.java 2 s.c o m*/ * ==================================================================== * Copyright (c) 2004-2012 TMate Software Ltd. All rights reserved. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://svnkit.com/license.html * If newer versions of this license are posted there, you may use a * newer version instead, at your option. * ==================================================================== */ public class Main { public static char[] copyOf(char[] source) { final char[] copy = source != null ? new char[source.length] : null; if (copy != null) { System.arraycopy(source, 0, copy, 0, source.length); } return copy; } }