qualifiedthisexactmatch.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 1998 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 4102393 4133457
 * @summary Verify that <class>.this  matches <class> exactly, not a subclass.
 * @author maddox
 * 
 * @run compile QualifiedThisExactMatch.java
 * @run main QualifiedThisExactMatch
 */

public class QualifiedThisExactMatch {

    void test() throws Exception {}

    void checkIt1() throws Exception {
	QualifiedThisExactMatch z = new QualifiedThisExactMatch() {
            void test() throws Exception {
		if (this == QualifiedThisExactMatch.this) {
		    throw new Exception("anonymous");
		}
            }
	};
	z.test();
    }

    //---
    
    class A  {
	Object getThisA() { return A.this; }
	class B extends A {
	    Object getThisA() { return A.this; }
	    Object getThisB() { return B.this; }
	}
    }

    void check(Object x, Object y) throws Exception {
	if (x != y) {
	    throw new Exception("named");
	}
    }

    void checkIt2 () throws Exception {
	A a = new A();
	A.B b = a.new B();

	check(a, a.getThisA());
	check(a, b.getThisA());
	check(b, b.getThisB());
    }

    //---

    public static void main(String[] s) throws Exception {
	QualifiedThisExactMatch x = new QualifiedThisExactMatch();
	x.checkIt1();
	x.checkIt2();
    }
}