【Java SE】HashMap和Properties的遍历方式

HashMap的遍历方式

方式一

HashMap<Integer, Object> map = new HashMap<>();
Set<Integer> set = map.keySet();
Iterator it = set.iterator();
while (it.hasNext()) {
	Integer key = (Integer) it.next();
	Object value = map.get(key);
}

方式二

HashMap<Integer, Object> map = new HashMap<>();
Set<Map.Entry<Integer, Object>> set = map.entrySet();
Iterator it = set.iterator();
while (it.hasNext()) {
     Map.Entry entry = (Map.Entry) it.next();
     Integer key = (Integer) entry.getKey();
     Object value = entry.getValue();
}

Properties的遍历方式

Properties prop = new Properties();
Enumeration en = prop.propertyNames();
while (en.hasMoreElements()) {
    String key = (String) en.nextElement();
    String value = prop.getProperty(key);
}