/* * Copyright (c) 2015, 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 8020968 * @summary Basic test for Stream state * @run main StackStreamState */ import java.lang.StackWalker.StackFrame; import java.util.stream.Stream; public class StackStreamState { public static void main(String... args) { StackStreamState test = new StackStreamState(); test.testStatic(); test.testInstance(); test.testLocal(); } private static Stream staticStream; private Stream instanceStream; private final StackWalker walker = StackWalker.getInstance(); void testStatic() { walker.walk(s -> { staticStream = s; return null; }); checkStreamState(staticStream); } void testInstance() { walker.walk(s -> { instanceStream = s; return null; }); checkStreamState(instanceStream); } void testLocal() { Stream stream = walker.walk(s -> { return s; }); checkStreamState(stream); } void checkStreamState(Stream stream) { try { stream.count(); throw new RuntimeException("IllegalStateException not thrown"); } catch (IllegalStateException e) { System.out.println("Got expected IllegalStateException: " + e.getMessage()); e.printStackTrace(System.out); } } }