1.遍歷map的最好方式 欧募，entryset.iterator()
使用泛型：
Map<Integer, Integer> map = new?HashMap<Integer, Integer>();
Iterator<Map.Entry<Integer, Integer>> entries = map.entrySet().iterator();
while?(entries.hasNext()) {
??Map.Entry<Integer, Integer> entry = entries.next();
??System.out.println("Key = "?+ entry.getKey() + ", Value = "?+ entry.getValue());
}
不使用泛型：
Map map = new?HashMap();
Iterator entries = map.entrySet().iterator();
while?(entries.hasNext()) {
??Map.Entry entry = (Map.Entry) entries.next();
??Integer key = (Integer)entry.getKey();
??Integer value = (Integer)entry.getValue();
??System.out.println("Key = "?+ key + ", Value = "?+ value);
}
