Code example for NavigableMap

Methods: pollFirstEntry

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  } 
 
  @MapFeature.Require(SUPPORTS_REMOVE) 
  @CollectionSize.Require(ZERO) 
  public void testEmptyMapPollFirst() { 
    assertNull(navigableMap.pollFirstEntry());
  } 
 
  @CollectionSize.Require(ZERO) 
  public void testEmptyMapNearby() { 
    assertNull(navigableMap.lowerEntry(samples.e0.getKey()));
    assertNull(navigableMap.lowerKey(samples.e0.getKey()));
    assertNull(navigableMap.floorEntry(samples.e0.getKey()));
    assertNull(navigableMap.floorKey(samples.e0.getKey()));
    assertNull(navigableMap.ceilingEntry(samples.e0.getKey()));
    assertNull(navigableMap.ceilingKey(samples.e0.getKey()));
    assertNull(navigableMap.higherEntry(samples.e0.getKey()));
    assertNull(navigableMap.higherKey(samples.e0.getKey()));
  } 
 
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