JSON解析数组中的数组（JAVA）

Question

I have a String which contains JSON File information.

    static String JSON_STRING2 ="{\"lex\": {\"seg\": [ [ 0, 8 ], [ 9, 5 ], [ 15, 6 ] ], \"s\": [ [ 0, 21 ] ], \"p\": [ [ 0, 21 ] ]}, \"morphology\": { \"msd\": [ [ [ \"red\", \"Agpmsnn\" ], [ \"red\", \"Agpfpan\" ], [ \"red\", \"Agpmsvn\" ] ], [ [ \"flower\", \"Ncfsgn-\" ], [ \"flower\", \"Ncfpnn-\" ], [ \"flower\", \"Ncfpvn-\" ] ], [ [ \"blossom\", \"Ncmsnn-\" ] ] ], \"stem\": [ \"rr\", \"ff\", \"bb\" ]}}";

What i want to do is to take this data ant save into arrays for further string comparision tasks, but at the moment i do not know how to reach bottom layer of "seg" layer and be able to take for example [0,8] values by its position in array. As far as I get is taking whole Array element via get() . I tried looping data but most of the time i end up with wrong array or arrayList types.

My preview code:

public static void main(String[] args) {

    // Create root JSON Object
    JSONObject object = new JSONObject(JSON_STRING2);
    System.out.println("--------------------------------");

    // Get Data Values
    JSONObject LEX = object.getJSONObject("lex");

    System.out.println("------------- Data Values ---------------");

    System.out.println("Array Words : " + LEX.getJSONArray("seg").get(1));
    System.out.println("Array Sentences : " + LEX.getJSONArray("s"));
    System.out.println("Array Paragraphs : " + LEX.getJSONArray("p"));
    System.out.println("--------------------------------");

    // Get Data Values
    JSONObject MORP = object.getJSONObject("morphology");
    System.out.println("------------- Data Values ---------------");
    System.out.println("Array wordCharacteristic : " + MORP.getJSONArray("msd"));}

Any tips or tricks? I have read bounch of articles here non of them parsing familiar data to mine. Thanks.

Answer 1

First of all, note that JSONArray are 0-indexed, like the arrays and lists in java. So LEX.getJSONArray("seg").get(1) return the second item in seg , thus printing [9,5] .

If you want the first , just use LEX.getJSONArray("seg").get(0) .

Now you can iterate on those JSONArray. There many ways to do that, here is one possibility:

    for (Object seg : LEX.getJSONArray("seg")) {
        JSONArray values = (JSONArray) seg;
        for (Object objValue : values) {
            int value = (int) objValue;
            System.out.print(value + " ");
        }
        System.out.println();
    }

will print this out:

0 8
9 5
15 6