// Json数组形式的字符串转为Map数组

String strArr = "[{"name": "xx", "age": "16"},{"name": "yy", "age": "18"}]";

    //第一种方式

    List<Map<String,String>> listObjectFir = (List<Map<String,String>>) JSONArray.parse(strArr);

    System.out.println("利用JSONArray中的parse方法来解析json数组字符串");

    for(Map<String,String> mapList : listObjectFir){

        for (Map.Entry entry : mapList.entrySet()){

           System.out.println( entry.getKey()  + "  " +entry.getValue());

        }

    }

    //第二种方式

    List<Map<String,String>> listObjectSec = JSONArray.parseObject(strArr,List.class);

    System.out.println("利用JSONArray中的parseObject方法并指定返回类型来解析json数组字符串");

    for(Map<String,String> mapList : listObjectSec){

        for (Map.Entry entry : mapList.entrySet()){

            System.out.println( entry.getKey()  + "  " +entry.getValue());

        }

    }

    //第三种方式

    JSONArray listObjectThir = JSONArray.parseArray(strArr);

    System.out.println("利用JSONArray中的parseArray方法来解析json数组字符串");

    for(Object mapList : listObjectThir){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

    //第四种方式

    List listObjectFour = JSONArray.parseArray(strArr,Map.class);

    System.out.println("利用JSONArray中的parseArray方法并指定返回类型来解析json数组字符串");

    for(Object mapList : listObjectFour){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

    //第五种方式

    JSONArray listObjectFifth = JSONObject.parseArray(strArr);

    System.out.println("利用JSONObject中的parseArray方法来解析json数组字符串");

    for(Object mapList : listObjectFifth){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

    //第六种方式

    List listObjectSix = JSONObject.parseArray(strArr,Map.class);

    System.out.println("利用JSONObject中的parseArray方法并指定返回类型来解析json数组字符串");

    for(Object mapList : listObjectSix){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

    //第七种方式

    JSONArray listObjectSeven = JSON.parseArray(strArr);

    System.out.println("利用JSON中的parseArray方法来解析json数组字符串");

    for(Object mapList : listObjectSeven){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

    //第八种方式

    List listObjectEigh = JSONObject.parseArray(strArr,Map.class);

    System.out.println("利用JSON中的parseArray方法并指定返回类型来解析json数组字符串");

    for(Object mapList : listObjectEigh){

        for (Object entry : ((Map)mapList).entrySet()){

            System.out.println(((Map.Entry)entry).getKey()  + "  " +((Map.Entry)entry).getValue());

        }

    }

// map集合遍历

 Map<String, Integer> tempMap = new HashMap<String, Integer>();

  tempMap.put("a","12");

  tempMap.put("b","34");

  tempMap.put("c","56");

  // 遍历方法一 hashmap entrySet() 遍历

  Iterator it = tempMap.entrySet().iterator();

  while (it.hasNext()) {

   Map.Entry entry = (Map.Entry) it.next();

   Object key = entry.getKey();

   Object value = entry.getValue();

   System.out.println("key=" + key + " value=" + value);

  }

  // 遍历方法二

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

   String key = entry.getKey().toString();

   String value = entry.getValue().toString();

   System.out.println("key=" + key + " value=" + value);

  }

  // 遍历方法三 hashmap keySet() 遍历

  for (Iterator i = tempMap.keySet().iterator(); i.hasNext();) {

   Object obj = i.next();

   System.out.println(obj);// 循环输出key

   System.out.println("key=" + obj + " value=" + tempMap.get(obj));

  }

  for (Iterator i = tempMap.values().iterator(); i.hasNext();) {

   Object obj = i.next();

   System.out.println(obj);// 循环输出value

  }

  // 遍历方法四 treemap keySet()遍历

  for (Object o : tempMap.keySet()) {

   System.out.println("key=" + o + " value=" + tempMap.get(o));

  }

  // java如何遍历Map <String, ArrayList> map = new HashMap <String,

  // ArrayList>();

  System.out.println("java  遍历Map <String, ArrayList> map = new HashMap<String, ArrayList>();");

  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);

   }

  }

  Map<String, List> map = new HashMap<String, List>();

  for (Map.Entry entry : map.entrySet()) {

   String key = entry.getKey().toString();

   List<String> list= (List) entry.getValue();

   for (String value : list) {

    System.out.println(key + "====" + value);

   }

  }