test/langtools/tools/javac/InvalidIntfCast.java

/*
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 * 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 4023359 4948130
 * @summary The compiler should detect an invalid cast between interfaces.
 * @author turnidge
 *
 * @compile InvalidIntfCast.java
 */

interface I {
    void method();
}

interface J {
    int method();
}

public class InvalidIntfCast {
    public static void main(String[] args) {
        I i = null;
        J j = (J) i;
    }
}