interfacecast1.java

来自「是一款用JAVA 编写的编译器 具有很强的编译功能」· Java 代码 · 共 56 行

/*
 * Copyright 2001-2004 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

/*
 * @test
 * @bug 4453032
 * @summary overridden interface method causes the compiler to reject cast
 * @author gafter
 *
 * @compile -source 1.5 InterfaceCast1.java
 */

public class InterfaceCast1 {
    public static void main(String[] args) throws Exception {
    }
}

interface Collection<E> {
    <T> T[] toArray(T[] a);
}

interface Set<E> extends Collection<E> {
    <T> T[] toArray(T[] a);
}

interface SortedSet<E> extends Set<E> {
}

class TreeSet<E> {
    public void addAll(Collection<E> c) {
        if (c instanceof SortedSet) {
	    SortedSet<E> ss = (SortedSet<E>) c;
	}
    }
}