Java Code Examples for java.util.concurrent.ConcurrentHashMap.KeySetView

The following are Jave code examples for showing how to use KeySetView of the java.util.concurrent.ConcurrentHashMap class. You can vote up the examples you like. Your votes will be used in our system to get more good examples.
Example 1
Project: openjdk-jdk10   File: ConcurrentHashMap8Test.java   Source Code and License Vote up 7 votes
/**
 * KeySetView.getMappedValue returns the map's mapped value
 */
public void testGetMappedValue() {
    ConcurrentHashMap map = map5();
    assertNull(map.keySet().getMappedValue());
    try {
        map.keySet(null);
        shouldThrow();
    } catch (NullPointerException success) {}
    ConcurrentHashMap.KeySetView set = map.keySet(one);
    assertFalse(set.add(one));
    assertTrue(set.add(six));
    assertTrue(set.add(seven));
    assertSame(one, set.getMappedValue());
    assertNotSame(one, map.get(one));
    assertSame(one, map.get(six));
    assertSame(one, map.get(seven));
}