closure4.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 65 行

/*
 * Copyright 2001-2004 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 4030374
 * @summary Initialization of up-level links, immediately after super(), occurs too late.
 * @author gafter
 *
 * @compile -source 1.4 -target 1.4 Closure4.java
 * @run main Closure4
 */

// Make sure the closure is present when the superclass is constructed.
// Specifically, Closure4.$1 must have its Closure4.this initialized when Inner calls foo().

public class Closure4 {

    public int v;

    public Closure4() {
	v = 0;

	Inner i = new Inner() {
	    public void foo() {
		if (v != 0) throw new Error();
	    }
	};

	i.foo();
    }

    public static void main(String[] arg) {
	new Closure4();
    }
}

class Inner {
    Inner() {
	foo();
    }

    public void foo() { throw new Error(); }
}