Here you can find the source of copy(final List super T> list0, final List extends T> list1)
public static <T extends Object> void copy(final List<? super T> list0, final List<? extends T> list1)
//package com.java2s; /*// w w w. j a va 2 s.c o m * Copyright (C) 2013 Marcius da Silva da Fonseca. * * This library 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 2.1 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA */ import java.util.Collections; import java.util.List; public class Main { public static <T extends Object> void copy(final List<? super T> list0, final List<? extends T> list1) { Collections.copy(list0, list1); } }