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import java.util.*;

class TestSet3{

public static void main(String[] args) {

TreeSet tree = new TreeSet();

tree.add("one");

tree.add("two");

tree.add("three");

tree.add("four");

tree.add("five");

System.out.println(tree);

//tree.add(10);

/*

Exception in thread "main" java.lang.ClassCastException: java.lang.String cannot

be cast to java.lang.Integer

at java.lang.Integer.compareTo(Unknown Source)

at java.util.TreeMap.put(Unknown Source)

at java.util.TreeSet.add(Unknown Source)

at TestSet3.main(TestSet3.java:12)

*/

//tree.add(null);

/*

Exception in thread "main" java.lang.NullPointerException

at java.util.TreeMap.put(Unknown Source)

at java.util.TreeSet.add(Unknown Source)

at TestSet3.main(TestSet3.java:21)

*/

}

}