castfail13.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 59 行

/*
 * Copyright 2003 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 4916607
 * @summary Test casts (legal, warning, and errors)
 * @author gafter
 *
 * @compile/fail -source 1.5 CastFail13.java
 */

import java.util.*;

class CastTest {

    // --- Transferring parameters via supertypes ---

    private interface CA<T> { }
    private interface CB<T> extends CA<T> { }
    private interface CC<T> extends CA<T> { }

    private class CD<T> implements CB<T> { }
    private interface CE<T> extends CC<T> { }

    private interface CF<S> { }
    private interface CG<T> { }
    private class CH<S, T> implements CF<S>, CG<T> { }
    private interface CI<S> extends CF<S> { }
    private interface CJ<T> extends CG<T> { }
    private interface CK<S, T> extends CI<S>, CJ<T> { }

    private void supertypeParameterTransfer() {
	Object o;
	o = (CE<Number>) (CD<String>) null; // <<fail 13>>
    }

}