orig.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 50 行

/*
 * Copyright 2005-2007 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.
 */

package tests;

import java.util.Collection;
import java.util.Collections;

class CompileTest2 {

	class Request<R extends Request<R, V>,V> {}
	
	class DeltaRequest extends Request<DeltaRequest, double[]> {}

	class RequestMap<V> {
		public <R extends Request<R, W>, W extends V> R test (Collection<R> c) {
			// In my real code I make use of W of course
			return null;
		}

	}

	public void f () {
		RequestMap<Object> m = new RequestMap<Object> ();
		Collection<DeltaRequest> c = Collections.singleton (new DeltaRequest ());
		// This line not compile?
		DeltaRequest o = m.<DeltaRequest, double[]>test (c);
	}
}