[Java] 遍历HashMap和HashMap转换成List的两种方式

/**
* convert the map to the list(1)
*/
public static void main(String[] args) {
Map<String, String> maps = new HashMap<String, String>();
maps.put("a", "aa");
maps.put("b", "bb");
maps.put("c", "cc");
maps.put("d", "dd");
maps.put("e", "ee");
maps.put("f", "ff");

List<String> strList = new ArrayList<String>();

for (String str : maps.values()) {
strList.add(str);
}

for (int i = 0; i < strList.size(); i++) {

System.out.println(strList.get(i));
}
}

/**
* convert the map to the list(2)
*/
public static void main(String[] args) {
Map<String, String> maps = new HashMap<String, String>();
maps.put("a", "aa");
maps.put("b", "bb");
maps.put("c", "cc");
maps.put("d", "dd");
maps.put("e", "ee");
maps.put("f", "ff");

List<String> strList = new ArrayList<String>(maps.values());

for (int i = 0; i < strList.size(); i++) {

System.out.println(strList.get(i));
}
}