Java 将 JSONObject 中的所有键转换为 String 数组
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To get all the keys in JSONObject into String array
提问by kishore
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 heregetNames() but it's not working.
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这里）getNames（但它不工作。
I can go over each key using iterator and can construct a keys String array but i want any default method if exists.
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，但我想要任何默认方法（如果存在）。
回答by alexey28
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:
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。去做吧：
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, );
回答by Iriminage
There is not getNames(), but there is Names()
没有getNames()，但有Names()
