import java.util.*;

public class TestMap {

public static void main (String[] args) {

Map<String, Integer> testMap = new TreeMap<String, Integer>();

//Map<String, Integer> testMap = new HashMap<String, Integer>();

//Map<String, Integer> testMap = new LinkedHashMap<String, Integer>();

//Map<String, Integer> testMap = new Hashtable<String, Integer>();

testMap.put("Allen", 1);

testMap.put("Jack", 3);

testMap.put("Tom", 5);

testMap.put("Tom", 7);

int curVal = testMap.get("Tom");

System.out.println("Tom = " + curVal);

System.out.println("Current Size = " + testMap.size());

testMap.remove("Tom");

boolean checkContainKey = testMap.containsKey("Tom");

System.out.println("Contains Tom ? " + checkContainKey);

System.out.println("Tom value = " + testMap.get("Tom"));

for (Map.Entry<String, Integer> entry : testMap.entrySet()) {

System.out.println(entry.getKey() + ": " + entry.getValue());

}

System.out.println("Anna: " + testMap.getOrDefault("Anna", 0));

System.out.println("Jack: " + testMap.getOrDefault("Jack", 0));

}

}