import java.util.ArrayList;
import java.util.List;

/**
 * 基於arraylist實現hashmap集合(簡版：效率低)
 * @author zjmiec
 *
 */
public class ExtArrayListHashMap<Key, Value> {
	// map容器
	List<Entry<Key, Value>> tables = new ArrayList<>();
	int size;

	// put
	public void put(Key key, Value value) {
		Entry<Key, Value> entery = getEntry(key);
		if (entery != null) {
			entery.value=value;
		} else {
			Entry<Key, Value> newEntery = new Entry<Key, Value>(key, value);
			tables.add(newEntery);
		}
		size = tables.size();
	}

	public Value get(Key key) {
		Entry<Key, Value> entry = getEntry(key);
		return entry == null ? null : entry.value;
	}

	public Entry<Key, Value> getEntry(Key key) {
		for (Entry<Key, Value> entry : tables) {
			if (entry.key.equals(key)) {
				return entry;
			}
		}
		return null;
	}

	public int getSize() {
		return tables.size();
	}

	public static void main(String[] args) {

		ExtArrayListHashMap<String, String> extArrayListHashMap = new ExtArrayListHashMap<String, String>();

		extArrayListHashMap.put("a", "aa");
		extArrayListHashMap.put("b", "bb");
		extArrayListHashMap.put("c", "cc");
		extArrayListHashMap.put("c", "dd");
		System.out.println(extArrayListHashMap.get("c"));
		//System.out.println(extArrayListHashMap.size);

		/*
		 * String str = (String) extArrayListHashMap.get("a");
		 * System.out.println(str);
		 */
	}
}

// hash儲存物件
class Entry<Key, Value> {
	Key key;// hashmap集合的key
	Value value;// hashmap集合的value

	public Entry(Key key, Value value) {
		super();
		this.key = key;
		this.value = value;
	}

}