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import java.util.*; public class CollectionsUnmodifiableNavigableMapExample2 { public static void main(String[] args) { NavigableMap<Integer, String> map = new TreeMap<>(); map.put(1, "one"); map.put(2, "two"); System.out.println("Initial Unmodifiable Navigable Map: "+map); NavigableMap<Integer, String> map2 = Collections.unmodifiableNavigableMap(map); map2.put(3, "three"); } }
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