package teat;


import java.util.*;

import java.util.Map.Entry;


/**

 * @author linjitai

 */

public class ThreeIterator {

 public static void main(String[] args) {

 Map<String, String> map = new HashMap<>();

 map.put("001", "宝马");

 map.put("002", "奔驰");

 map.put("003", "奥迪");

 firstIterator(map);

 System.out.println("===");

 twoIterator(map);

 System.out.println("===");

 threeItertor(map);

 }

 /**

  * entry

  * @param map

  * @return

  */

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

 for (Entry<String, String> entry : map.entrySet()) {

 String keys = entry.getKey();

 String values = entry.getValue();

 System.out.println("key = "+ keys + ";value = "+ values);

 }

 }

 /**

  * keySet

  * @param map

  */

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

 for (String keys : map.keySet()) {

 String values = map.get(keys);

 System.out.println("key = "+ keys + ";value = "+ values);

 }

 }

 /**

  * 

  * @param map

  */

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

 Iterator<String> keys = map.keySet().iterator();

 while (keys.hasNext()) {

 String key = keys.next();

 String value = map.get(key);

 System.out.println("key = "+ key + ";value = "+ value);

 }

 }

}

 /**

Output
key = 001;value = 宝马
key = 002;value = 奔驰
key = 003;value = 奥迪
===
key = 001;value = 宝马
key = 002;value = 奔驰
key = 003;value = 奥迪
===
key = 001;value = 宝马
key = 002;value = 奔驰
key = 003;value = 奥迪*/