TreeMap Progam - General Functions

public static void generalFunctionsDemo(String args[])
{
 TreeMap tm1 = new TreeMap();
 System.out.println("tm1 isEmpty() before adding elements: " + tm1.isEmpty());
 tm1.put("one", 1);
 tm1.put("apple", "red");
 tm1.put("two", 2);
 tm1.put("three", 3);
 tm1.put("four", 4);

 System.out.println("tm1 isEmpty() after adding elements: " + tm1.isEmpty());
 System.out.println("Key/value pairs of tm1:" +  tm1);

 System.out.println("\napple key exists: " + tm1.containsKey("apple"));
 System.out.println("two key exists: " + tm1.containsKey("two"));
 System.out.println("red value exists: " + tm1.containsValue("red"));
 System.out.println("2 value exists: " + tm1.containsValue(2));

 System.out.println("\nValue of three: " + tm1.get("three"));
 System.out.println("Value of four: " + tm1.get("four"));

 System.out.println("\nNo. of elements before removal: " + tm1.size());
 tm1.remove("one");
 System.out.println("No. of elements after removal: " + tm1.size());
 tm1.clear();
 System.out.println("No. of elements after clear(): " + tm1.size());
}