boundbug.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * 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 4890134
 * @summary generics: used of ? get bound error
 * @author gafter
 *
 * @compile -source 1.5 BoundBug.java
 */

class BoundBug {
    class C {}

    class B<T extends C> 
    {
	void foo() {
	    B<? super T> con = null;   //ok
	    B<? extends T> cov = null; //ok
	    B<?>  biv = null;          //fails
	    B<T>  inv = null;  
	}
    }

    static 
    {
    	B<? super C> con = null;    //ok
	B<? extends C> cov = null;  //ok
	B<?>  biv = null;           //fails
	B<C>  inv = null; 
    }
}