Mapの遍歴方式まとめ

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class MapTest {

	public static void main(String[] args) {
		Map<String, String> map = new HashMap<String, String>();
		map.put("1", "1");
		map.put("2", "2");
		map.put("3", "3");


		//    ：  Map.keySet  key value
		System.out.println("  Map.keySet  key value:");
		for (String key : map.keySet()) {
			System.out.println("key= " + key + "  and  value= " + map.get(key));
		}
		
		//    ：  Map.entrySet  iterator  key value
		System.out.println("  Map.entrySet  iterator  key value:");
		Iterator<Map.Entry<String, String>> it = map.entrySet().iterator();
		while (it.hasNext()) {
			Map.Entry<String, String> entry = it.next();

			System.out.println("key= " + entry.getKey() + "  and  value= "
					+ entry.getValue());
		}

		//    ：  Map.entrySet  key value
		System.out.println("  Map.entrySet  key value:");
		for (Map.Entry<String, String> entry : map.entrySet()) {
			System.out.println("key= " + entry.getKey() + "  and  value= "
					+ entry.getValue());
		}

		//    ：  Map.values()     value，       key
		System.out.println("  Map.values()     value:");
		for (String v : map.values()) {
			System.out.println("value= " + v);
		}
	}

}