尺寸可变的二维阵列
[英]2D Array with variable size
问题描述
What I'm trying to accomplish is have something like 
我想要完成的是
String[][] array = new String[sizeX][sizeY]
SizeX would be based on the length of a root JSON array, and sizeY based on the length of an array inside the root JSON array. SizeX基于根JSON数组的长度，sizeY基于根JSON数组内部的数组的长度。
Thinking about it, I could use a single array of arrays, but I'm not sure how I'd reference the internal array to get information back from it. 考虑一下，我可以使用单个数组数组，但是我不确定如何引用内部数组以从中获取信息。 For example: 例如：
String[] array = new String[sizeX];
array[i] = new String[sizeY]; // initialized to variable size of JSON
From here, how would I reference the internal array the objects in the internal array? 从这里开始，我将如何引用内部数组中的内部数组中的对象？
The JSON JSON
{"23591778": {
"pages": [
{
"masteries": [
{
"id": 4211,
"rank": 2
},
{
"id": 4214,
"rank": 2
},
{
"id": 4134,
"rank": 3
},
{
"id": 4124,
"rank": 1
},
{
"id": 4114,
"rank": 1
},
{
"id": 4222,
"rank": 3
},
{
"id": 4112,
"rank": 4
},
{
"id": 4221,
"rank": 1
},
{
"id": 4144,
"rank": 1
},
{
"id": 4122,
"rank": 3
},
{
"id": 4152,
"rank": 3
},
{
"id": 4141,
"rank": 1
},
{
"id": 4111,
"rank": 1
},
{
"id": 4132,
"rank": 1
},
{
"id": 4232,
"rank": 1
},
{
"id": 4162,
"rank": 1
},
{
"id": 4131,
"rank": 1
}
],
"id": 34787712,
"name": "Blind",
"current": false
},
{
"masteries": [
{
"id": 4212,
"rank": 2
},
{
"id": 4233,
"rank": 3
},
{
"id": 4242,
"rank": 1
},
{
"id": 4214,
"rank": 2
},
{
"id": 4114,
"rank": 1
},
{
"id": 4251,
"rank": 1
},
{
"id": 4112,
"rank": 4
},
{
"id": 4222,
"rank": 3
},
{
"id": 4122,
"rank": 3
},
{
"id": 4262,
"rank": 1
},
{
"id": 4224,
"rank": 1
},
{
"id": 4252,
"rank": 3
},
{
"id": 4132,
"rank": 1
},
{
"id": 4241,
"rank": 3
},
{
"id": 4232,
"rank": 1
}
],
"id": 34787713,
"name": "AD/Tank Jungle",
"current": false
},
{
"masteries": [
{
"id": 4242,
"rank": 1
},
{
"id": 4233,
"rank": 3
},
{
"id": 4243,
"rank": 1
},
{
"id": 4211,
"rank": 2
},
{
"id": 4214,
"rank": 2
},
{
"id": 4213,
"rank": 2
},
{
"id": 4114,
"rank": 1
},
{
"id": 4252,
"rank": 2
},
{
"id": 4222,
"rank": 3
},
{
"id": 4113,
"rank": 4
},
{
"id": 4221,
"rank": 1
},
{
"id": 4123,
"rank": 3
},
{
"id": 4262,
"rank": 1
},
{
"id": 4224,
"rank": 1
},
{
"id": 4133,
"rank": 1
},
{
"id": 4234,
"rank": 1
},
{
"id": 4232,
"rank": 1
}
],
"id": 34787714,
"name": "Mumu",
"current": true
},
{
"masteries": [
{
"id": 4211,
"rank": 2
},
{
"id": 4121,
"rank": 1
},
{
"id": 4214,
"rank": 2
},
{
"id": 4134,
"rank": 3
},
{
"id": 4114,
"rank": 1
},
{
"id": 4222,
"rank": 3
},
{
"id": 4112,
"rank": 4
},
{
"id": 4144,
"rank": 1
},
{
"id": 4221,
"rank": 1
},
{
"id": 4152,
"rank": 3
},
{
"id": 4122,
"rank": 3
},
{
"id": 4141,
"rank": 1
},
{
"id": 4111,
"rank": 1
},
{
"id": 4132,
"rank": 1
},
{
"id": 4232,
"rank": 1
},
{
"id": 4162,
"rank": 1
},
{
"id": 4131,
"rank": 1
}
],
"id": 34787715,
"name": "vi/j4/wuk/xin/noc",
"current": false
},
{
"masteries": [
{
"id": 4212,
"rank": 2
},
{
"id": 4353,
"rank": 3
},
{
"id": 4211,
"rank": 2
},
{
"id": 4311,
"rank": 1
},
{
"id": 4362,
"rank": 1
},
{
"id": 4322,
"rank": 3
},
{
"id": 4334,
"rank": 1
},
{
"id": 4332,
"rank": 1
},
{
"id": 4352,
"rank": 1
},
{
"id": 4222,
"rank": 3
},
{
"id": 4314,
"rank": 1
},
{
"id": 4221,
"rank": 1
},
{
"id": 4331,
"rank": 3
},
{
"id": 4324,
"rank": 1
},
{
"id": 4313,
"rank": 3
},
{
"id": 4232,
"rank": 1
},
{
"id": 4342,
"rank": 1
},
{
"id": 4341,
"rank": 1
}
],
"id": 34787716,
"name": "Support",
"current": false
},
{
"masteries": [
{
"id": 4211,
"rank": 2
},
{
"id": 4214,
"rank": 2
},
{
"id": 4124,
"rank": 1
},
{
"id": 4114,
"rank": 1
},
{
"id": 4112,
"rank": 4
},
{
"id": 4222,
"rank": 3
},
{
"id": 4113,
"rank": 4
},
{
"id": 4122,
"rank": 3
},
{
"id": 4152,
"rank": 3
},
{
"id": 4224,
"rank": 1
},
{
"id": 4132,
"rank": 1
},
{
"id": 4142,
"rank": 3
},
{
"id": 4232,
"rank": 1
},
{
"id": 4162,
"rank": 1
}
],
"id": 34787717,
"name": "AD Jungle",
"current": false
},
{
"masteries": [
{
"id": 4212,
"rank": 2
},
{
"id": 4211,
"rank": 2
},
{
"id": 4121,
"rank": 1
},
{
"id": 4134,
"rank": 3
},
{
"id": 4124,
"rank": 1
},
{
"id": 4114,
"rank": 1
},
{
"id": 4222,
"rank": 3
},
{
"id": 4112,
"rank": 4
},
{
"id": 4221,
"rank": 1
},
{
"id": 4122,
"rank": 3
},
{
"id": 4152,
"rank": 3
},
{
"id": 4141,
"rank": 1
},
{
"id": 4142,
"rank": 1
},
{
"id": 4132,
"rank": 1
},
{
"id": 4232,
"rank": 1
},
{
"id": 4162,
"rank": 1
},
{
"id": 4131,
"rank": 1
}
],
"id": 34787718,
"name": "ADC",
"current": false
},
],
"summonerId": 23591778
}}
2 个解决方案
解决方案1
1 已采纳 2014-05-05 15:42:31
UPDATE: since you updated your post with more info, here is my new answer. 更新：由于您更新了更多信息，所以这是我的新答案。
You don't have a JSON array of JSON arrays, but an array of JSON objects. 您没有JSON数组的JSON数组，但是有JSON对象的数组。 These objects, in turn, have one property that is a map (I believe), but it does not matter. 这些对象又具有一个属性，即地图（我相信），但这并不重要。 You're trying to use a 2D-array instead of a 1D-array of objects. 您正在尝试使用2D数组而非对象的1D数组。
Create a class to represent your objects: 创建一个代表您的对象的类：
public class MasteryPage {
private long id;
private String name;
private boolean current;
private Map<Long,Integer> masteries = new HashMap<>();
public MasteryPage(long id, String name, boolean current) {
this.id = id;
this.name = name;
this.current = current;
}
public void addMastery(long id, int rank) {
masteries.put(id, rank);
}
// add getters/setters...
}
Then use your class to create the array: 然后使用您的类创建数组：
JSONArray jArray = json.getJSONArray("pages");
MasteryPage[] arr = new MasteryPage[jArray.length()];
for (int i = 0; i < jArray.length(); i++) {
JSONObject jsonMasteryPage = jArray.getJSONObject(i);
long id = jsonMasteryPage.getLong("id");
String name = jsonMasteryPage.getString("name");
boolean current = jsonMasteryPage.getBoolean("current");
MasteryPage page = new MasteryPage(id, name, current);
JSONArray jsonMasteries = jsonMasteryPage.getJSONArray("masteries");
for (int j = 0; j < jsonMasteries.length(); j++) {
JSONObject jsonMastery = jsonMasteries.getJSONObject(i);
page.addMastery(jsonMastery.getLong("id"), jsonMastery.getInt("rank"));
}
arr.add(page);
}
You can then create each mastery page and parse the JSON to fill its fields. 然后，您可以创建每个精通页面并解析JSON以填充其字段。
解决方案2
0 2014-05-05 14:39:20
Declare it like this: 像这样声明：
String[][] arr = new String[][numRows];
And then add arrays to it by either of the following means: 然后通过以下两种方式向其添加数组：
arr[0] = new String[lengthOfJSONArray];
arr[0] = getStringArray();
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.