Map<String, ArrayList> map = new HashMap<String, ArrayList>();
   Set<String> keys = map.keySet();
   Iterator<String> iterator = keys.iterator();
   while (iterator.hasNext()) {
        String key = iterator.next();
        ArrayList arrayList = map.get(key);
        for (Object o : arrayList) {
            System.out.println(o + "遍历过程");
        }
    }

    Map<String, Integer> tempMap = new HashMap<String, Integer>();
    tempMap.put("a", 1);
    tempMap.put("b", 2);
    tempMap.put("c", 3);
    for (String o : tempMap.keySet()) {
        System.out.println("key=" + o + " value=" + tempMap.get(o));
    }

    Map<String, Integer> tempMap = new HashMap<String, Integer>();
    tempMap.put("a", 1);
    tempMap.put("b", 2);
    tempMap.put("c", 3);
    for (Iterator i = tempMap.keySet().iterator(); i.hasNext();) {
        String obj = i.next();
        System.out.println(obj);// 循环输出key
        System.out.println("key=" + obj + " value=" + tempMap.get(obj));
    }