jdk/test/java/lang/Class/asSubclass/BasicUnit.java

/*
 * 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.
 *
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 */

/*
 * @test
 * @bug 5030212
 * @summary please add a typesafe cast for Class<?> types
 * @author gafter
 *
 * @compile -Xlint:unchecked -Werror -source 1.5 BasicUnit.java
 * @run main BasicUnit
 */

interface Int {
    void main();
}

class MyInt implements Int {
    public void main() {
        System.out.println("Hello, world!");
    }
}

public class BasicUnit {
    static <T extends Int> T factory(Class<T> c) throws Throwable {
        return c.newInstance();
    }
    public static void main(String[] args) throws Throwable {
        factory(Class.forName("MyInt").asSubclass(Int.class)).main();
    }
}