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import java.util.*; public class CollectionsNewSetFromMapExample1 { public static void main(String[] args) { // create map Map<String, Boolean> map = new WeakHashMap<String, Boolean>(); // create a set from map Set<String> set = Collections.newSetFromMap(map); // add values in set set.add("Raj"); set.add("Rahul"); set.add("Karan"); // set and map values are System.out.println("Set is: " + set); System.out.println("Map is: " + map); } }
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