test/tools/javac/generics/wildcards/neg/AmbiguousCast.java

/*
 * 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 4897892
 * @summary cast to parameterized type is accepted although it should be rejected
 * @author gafter
 *
 * @compile/fail -source 1.5 -Werror -Xlint:unchecked AmbiguousCast.java
 */

class Test {

    private static class GenericWrapper<Elem> {
        private Elem theObject;
        public GenericWrapper(Elem arg) {
            theObject = arg;
        }
        public <T extends Elem> GenericWrapper (GenericWrapper<T> other) {
            this.theObject = other.theObject;
        }
        public String toString() {
            return theObject.toString();
        }
    }
    private static GenericWrapper<String> method (Object wrappedString) {
        return (GenericWrapper<String>) wrappedString;
    }

    public static void main(String[] args) {
        System.out.println(method(new GenericWrapper<String>("abc")));
        System.out.println(method(new GenericWrapper<Exception>(new Exception())));
    }
}