import java.util.Set;
import java.util.TreeSet;
public class Main {
public static void main(String[] args) {
Set treeSet = new TreeSet();
treeSet.add("2"); treeSet.add("4"); treeSet.add("6"); treeSet.add("8");
System.out.println("first : " + ((TreeSet)treeSet).first());
System.out.println("floor(6) : " + ((TreeSet)treeSet).floor("6"));
System.out.println("higher(6) : " + ((TreeSet)treeSet).higher("6"));
System.out.println("last : " + ((TreeSet)treeSet).last());
}
}
first : 2
floor(6) : 6
higher(6) : 8
last : 8
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