The ceilingEntry(k) method of the NavigableMap interface returns a key value pair with the least key in the map greater than or equal to k. It returns a null value if no such key is found. The ceilingEntry(k) method throws the ClassCastException if the specified key cannot be compared with the keys currently in the map. It throws the NullPointerException if the specified key is null and this map does not permit null keys.
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