将 JSONObject 中的所有键转换为 String 数组 [英] To get all the keys in JSONObject into String array
问题描述
我想从现有的 json 对象创建一个 json 对象.为此,我想将 JSONObject 中的所有键都放到 String[] 数组中.是否有任何默认方法可以将键放入字符串数组中.我发现存在一个静态方法 here getNames() 但它不起作用.
I want to create a json object from existing json object. For this i want to get all the keys in JSONObject to a String[] array. Is there any default method to get the keys into a String array. I found there exists a static method here getNames() but it's not working.
我可以使用迭代器遍历每个键,并且可以构造一个键字符串数组,但我想要任何存在的默认方法.
I can go over each key using iterator and can construct a keys String array but i want any default method if exists.
推荐答案
要从其他 JSONObject 构造 JSONObject,您可以使用接受 JSONObject 和应复制的键名数组的构造函数.这样做:
To construct JSONObject from other JSONObject you can use constructor that accept JSONObject and array of keys names that should be copied. To do it:
Iterator keysToCopyIterator = firstJSONObject.keys();
List<String> keysList = new ArrayList<String>();
while(keysToCopyIterator.hasNext()) {
String key = (String) keysToCopyIterator.next();
keysList.add(key);
}
String[] kesyArray = keysList.toArray(new String[keysList.size()]);
JSONObject secondJSONObject = new JSONObject(firstJSONObject, );
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