whichimplicitthis2.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 52 行

/*
 * Copyright 2002-2003 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 4635044 4787017
 * @summary Invalid error when implicitly referencing enclosing type
 *
 * @compile WhichImplicitThis2.java
 * @run main WhichImplicitThis2
 */

/** Check that hiding prevents enclosing class selection. */
public class WhichImplicitThis2 {
    boolean isX() { return false; }
    class Middle {
        boolean enclIsX() { return WhichImplicitThis2.this.isX(); }
    }
    class X extends WhichImplicitThis2 {
        boolean isX() { return true; }
        class Middle {} // hide WhichImplicitThis2.Middle
        boolean check() {
            return /*X.this.*/new WhichImplicitThis2.Middle().enclIsX();
        }
    }
    public static void main(String[] args) {
        WhichImplicitThis2 t = new WhichImplicitThis2();
        X x = t.new X();
        if (!x.check()) throw new Error();
    }
}