Here you can find the source of clone(Object a)
public static Object clone(Object a)
//package com.java2s; /*/*from w w w . ja v a 2 s . c o m*/ * This file is part of Herschel Common Science System (HCSS). * Copyright 2001-2010 Herschel Science Ground Segment Consortium * * HCSS 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. * * HCSS 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 along with HCSS. * If not, see <http://www.gnu.org/licenses/>. */ public class Main { public static Object clone(Object a) { if (a instanceof double[]) { return ((double[]) a).clone(); } if (a instanceof float[]) { return ((float[]) a).clone(); } if (a instanceof long[]) { return ((long[]) a).clone(); } if (a instanceof int[]) { return ((int[]) a).clone(); } if (a instanceof short[]) { return ((short[]) a).clone(); } if (a instanceof byte[]) { return ((byte[]) a).clone(); } if (a instanceof boolean[]) { return ((boolean[]) a).clone(); } throw new IllegalArgumentException("The argument is not a number array."); } }