// 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); } }