public static void main(String[] args) {

System.out.println("TreeSet is like HashSet but it sorts the elements in ascending order.");

TreeSet<String> treeSet = new TreeSet<String>(); // Instance using Default Constructor

treeSet.add("Simple"); // adding elements using the .add() method

treeSet.add("TreeSet");

treeSet.add("TreeSet");

System.out.println(treeSet); // output will be a set of strings in the instance.

// TreeSet is implemented from the SortedSet interface and will omit duplicates

TreeSet<Integer> duplicateEntryTreeSet = new TreeSet<Integer>();

duplicateEntryTreeSet.add(300);

duplicateEntryTreeSet.add(102);

duplicateEntryTreeSet.add(102); // Duplicate value will not be stored

System.out.println(duplicateEntryTreeSet); // Output will be [102, 300]

// Objects stored in TreeSet should be homogeneous

// and comparable otherwise the program will throw an exception

TreeSet<StringBuilder> builderSet = new TreeSet<StringBuilder>();

builderSet.add(new StringBuilder("T")); // Will result in java.lang.ClassCastException

builderSet.add(new StringBuilder("M"));

builderSet.add(new StringBuilder("I"));

}