selfimplement.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 2002 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 4725668
 * @summary generics: reject implementation with incorrect return type
 * @author gafter
 *
 * @compile/fail -source 1.5 SelfImplement.java
 */

class SelfImplement {
    static abstract class A<T> {
        abstract void f(T t);
        public int f(Integer t) { return 3; }
    }
    static abstract class B extends A<Integer> {
        // error: A<Integer>.f(Integer) returning int can't implement
        //        A<Integer>.f(Integer) returning void.
    }
}