import java.util.*;

public class MapDemo {
  public static void main(String args[]) { 
	  String days[]={"Sunday", "Monday", "Tuesday", "Wednesnday", "Thursday", "Friday", "Saturday"};
	 Map<Integer, String> map = new HashMap<Integer, String>();
	try{
	for(int i=0; i<7; i++){
		map.put(i, days[i]);
	}
	
	TreeMap<Integer, String> tMap=new TreeMap<Integer, String>(map);
   	//Rerieving all keys
		System.out.println("Keys of tree map: " + tMap.keySet());
		//Rerieving all values
		System.out.println("Values of tree map: " + tMap.values());
		//Rerieving the First key and its value
		System.out.println("First key: " + tMap.firstKey() + " Value: " + tMap.get(tMap.firstKey()) + "\n");
			
		//Removing the first key and value
		System.out.println("Removing first data: " + tMap.remove(tMap.firstKey()));
		System.out.println("Now the tree map Keys: " + tMap.keySet());
		System.out.println("Now the tree map contain: " + tMap.values() + "\n");
		//Rerieving the Last key and value
		System.out.println("Last key: " + tMap.lastKey() + " Value: " + tMap.get(tMap.lastKey()) + "\n");	
		//Removing the last key and value
		System.out.println("Removing last data: " + tMap.remove(tMap.lastKey()));
		System.out.println("Now the tree map Keys: " + tMap.keySet());
		System.out.println("Now the tree map contain: " + tMap.values());
	}
	catch(Exception e){}
  }
}