java 遍历map

常用第一种方法

private static volatile Hashtable<Integer, Channel> hm = new Hashtable<Integer, Channel>();
java.util.Iterator<Entry<Integer, Channel>> iter = hm.entrySet().iterator();

        while (iter.hasNext()) {    
            Map.Entry entry = (Map.Entry) iter.next();
            //获取key
            int key = (Integer) entry.getKey();
            //获取Value
            channel = (Channel) entry.getValue();
            System.out.println("key=" + key);

        }

常用第二种方法 性能好 简单

for (Entry<String, Integer> entry : hmp.entrySet()) {


            System.err.println("人物hashKey = " + entry.getKey() + ", Value = " + entry.getValue());

        }