Map集合

Map<Integer, String> map = new HashMap<Integer, String>();
map.put(1, "dog");
map.put(2, "tiger");
//方式1，利用keySet方法的迭代器
for (Iterator<Integer> it=map.keySet().iterator();it.hasNext();){
Integer key = it.next();
String value = map.get(key);
System.out.println(key+":"+value);
}

//方式2，利用entrySet方法的迭代器
for (Iterator<Map.Entry<Integer, String>> it=map.entrySet().iterator();it.hasNext();){
Map.Entry<Integer, String> me = it.next();
Integer key = me.getKey();
String value = me.getValue();
System.out.println(key+":"+value);
}