attributeset.java

是一款用JAVA 编写的编译器 具有很强的编译功能

/*
 * Copyright 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 5073079
 * @summary Allow unchecked override of generified methods in
 * parameterless classes
 * @author Peter von der Ah\u00e9
 *
 * @compile -Xlint:unchecked -Werror AttributeSet.java
 */

interface Attribute<T> { }

interface AttributeSet2 {
    <T> Attribute<?> get(Class<T> category);
}

class AttributeSet2Impl implements AttributeSet2 {
    public Attribute get(Class category) { return null; }
}

interface AttributeSet3 {
    Attribute<?> get(Class<?> category);
}

class AttributeSet3Impl implements AttributeSet3 {
    public Attribute get(Class category) { return null; }
}

interface AttributeSet4 {
    Attribute<?> get(Number category);
}

class AttributeSet4Impl implements AttributeSet4 {
    public Attribute get(Number category) { return null; }
}

interface AttributeSet5 {
    Attribute<?> get(Attribute<Number> category);
}

class AttributeSet5Impl implements AttributeSet5 {
    public Attribute get(Attribute category) { return null; }
}

interface I1<T> {
    void f(Attribute<T> l);
}

class C1 implements I1<String> {
    public void f(Attribute l) { }
    void test() {
	Attribute<Number> n = null;
	f(n);
    }
}

interface A2 {
    void f(Attribute<String> a);
}

class B2 {
    public void f(Attribute a) { }
}

class C2 extends B2 implements A2 {
    void test(Attribute<Number> a) {
	f(a);
    }
}