Java Map遍历的各种步骤

Java Map遍历的各种方法

//最常规的一种遍历方法，最常规就是最常用的，虽然不复杂，但很重要，这是我们最熟悉的，就不多说了！！
??? public static void work(Map<String, Student> map) {
??????? Collection<Student> c = map.values();
??????? Iterator it = c.iterator();
??????? for (; it.hasNext();) {
??????????? System.out.println(it.next());
??????? }
??? }
　　//利用keyset进行遍历，它的优点在于可以根据你所想要的key值得到你想要的 values，更具灵活性！！
??? public static void workByKeySet(Map<String, Student> map) {
??????? Set<String> key = map.keySet();
??????? for (Iterator it = key.iterator(); it.hasNext();) {
??????????? String s = (String) it.next();
??????????? System.out.println(map.get(s));
??????? }
??? }
　　//比较复杂的一种遍历在这里，呵呵~~他很暴力哦，它的灵活性太强了，想得到什么就能得到什么~~
??? public static void workByEntry(Map<String, Student> map) {
??????? Set<Map.Entry<String, Student>> set = map.entrySet();
??????? for (Iterator<Map.Entry<String, Student>> it = set.iterator(); it.hasNext();) {
??????????? Map.Entry<String, Student> entry = (Map.Entry<String, Student>) it.next();
??????????? System.out.println(entry.getKey() + "--->" + entry.getValue());
??????? }
??? }
}