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import java.util.Collection;

import java.util.TreeSet;

public class javacollection3 {

Collection<Integer> collection = new TreeSet<>();

public static void main(String[] args) {

javacollection3 a = new javacollection3();

a.collection.add(1);

a.collection.add(2);

a.collection.add(3);

a.collection.add(4);

System.out.println(a.collection);

}

}