Java example source code file (LambdaExpr21.java)

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Java - Java tags/keywords

assertionerror, checker, lambdaexpr21, sam

The LambdaExpr21.java Java example source code

/*
 * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 8006684
 * @summary Compiler produces java.lang.VerifyError: Bad type on operand stack
 * @run main LambdaExpr21
 */
public class LambdaExpr21 {

    static int assertionCount = 0;

    static void assertTrue(boolean cond) {
        assertionCount++;
        if (!cond)
            throw new AssertionError();
    }

    interface SAM {
        void foo();
    }

    static class Checker {
        Checker(boolean cond) {
            assertTrue(cond);
        }
    }

    static {
        SAM s = ()-> { new Checker(true) { }; };
        s.foo();
    }

    static void test(){
        SAM s = ()-> { new Checker(true) { }; };
        s.foo();
    }

    static SAM s = ()-> { new Checker(true) { }; };

    public static void main(String[] args) {
        test();
        s.foo();
        assertTrue(assertionCount == 3);
    }
}