package thinkinginjava.containers;

// Things you can do with Maps.

import static thinkinginjava.util.Print.print;

import static thinkinginjava.util.Print.printnb;

import java.util.HashMap;

import java.util.IdentityHashMap;

import java.util.LinkedHashMap;

import java.util.Map;

import java.util.TreeMap;

import java.util.WeakHashMap;

import java.util.concurrent.ConcurrentHashMap;

import thinkinginjava.util.CountingMapData;

public class Maps {

public static void printKeys(Map<Integer, String> map) {

printnb("Size = " + map.size() + ", ");

printnb("Keys: ");

print(map.keySet()); // Produce a Set of the keys

}

public static void test(Map<Integer, String> map) {

print(map.getClass().getSimpleName());

map.putAll(new CountingMapData(25));

// Map has 'Set' behavior for keys:

map.putAll(new CountingMapData(25));

printKeys(map);

// Producing a Collection of the values:

printnb("Values: ");

print(map.values());

print(map);

print("map.containsKey(11): " + map.containsKey(11));

print("map.get(11): " + map.get(11));

print("map.containsValue(\"F0\"): " + map.containsValue("F0"));

Integer key = map.keySet().iterator().next();

print("First key in map: " + key);

map.remove(key);

printKeys(map);

map.clear();

print("map.isEmpty(): " + map.isEmpty());

map.putAll(new CountingMapData(25));

// Operations on the Set change the Map:

map.keySet().removeAll(map.keySet());

print("map.isEmpty(): " + map.isEmpty());

}

public static void main(String[] args) {

test(new HashMap<Integer, String>());

test(new TreeMap<Integer, String>());

test(new LinkedHashMap<Integer, String>());

test(new IdentityHashMap<Integer, String>());

test(new ConcurrentHashMap<Integer, String>());

test(new WeakHashMap<Integer, String>());

}

}