SetFromMap.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 6301089
 * @summary test Collections.newSetFromMap
 * @author Martin Buchholz
 */

import java.util.Collections;
import java.util.IdentityHashMap;
import java.util.Map;
import java.util.Set;

public class SetFromMap {
    static volatile int passed = 0, failed = 0;
    static void pass() { passed++; }
    static void fail() { failed++; Thread.dumpStack(); }
    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }
    static void check(boolean cond) { if (cond) pass(); else fail(); }
    static void equal(Object x, Object y) {
        if (x == null ? y == null : x.equals(y)) pass();
        else {System.out.println(x + " not equal to " + y); fail(); }}

    public static void main(String[] args) throws Throwable {
        try { realMain(); } catch (Throwable t) { unexpected(t); }

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
        if (failed > 0) throw new Exception("Some tests failed");
    }

    private static void realMain() throws Throwable {
        try {
            Map<String,Boolean> m = new IdentityHashMap<>();
            Set<String> s = Collections.newSetFromMap(m);
            String foo1 = new String("foo");
            String foo2 = new String("foo");
            String bar = new String("bar");
            check(s.add(foo1));
            check(s.add(foo2));
            check(s.add(bar));
            equal(s.size(), 3);
            check(s.contains(foo1));
            check(s.contains(foo2));
            check(! s.contains(new String(foo1)));
        } catch (Throwable t) { unexpected(t); }
    }
}