Use JSON Array inside JSON object in Java

Question

I have Array list with integer values from 2 to 6, and I test if each number is odd or even as following:

JSONObject outerObject = new JSONObject();
JSONArray outerArray = new JSONArray();
JSONObject [] innerObject = new JSONObject[list1.size()];
        for ( i = 0; i < list1.size(); i++)// change to list1.size()
            {
                innerObject[i]=new JSONObject();
                innerObject[i].put("Item" , list1.get(i));
                if(list1.get(i)%2==0)
                {
                    innerObject[i].put("Odd or Even", "number "+list1.get(i)+" is even");
                }
                else
                    innerObject[i].put("Odd or Even", "number "+list1.get(i)+" is odd");                  
                outerArray.put(innerObject[i]);
            }
        outerObject.put("rows", outerArray);
        return outerObject.toString();

then I have the following JSON file results

{"rows":[
{"Item":2,"Odd or Even":"number 2 is even"},
{"Item":3,"Odd or Even":"number 3 is odd"},
{"Item":4,"Odd or Even":"number 4 is even"},
{"Item":5,"Odd or Even":"number 5 is odd"},
{"Item":6,"Odd or Even":"number 6 is even"}
]}

now I want to find the multiplication between the array list item like:

{"rows":[
    {"Item":2,"Odd or Even":"number 2 is even", "Multiplication:[4,6]"},
    {"Item":3,"Odd or Even":"number 3 is odd","Multiplication:[6]"},
    {"Item":4,"Odd or Even":"number 4 is even"},
    {"Item":5,"Odd or Even":"number 5 is odd"},
    {"Item":6,"Odd or Even":"number 6 is even"}
    ]}

I know that I need to use another for loop inside the first loop, something like this

for (j=i; j < list1.size(); j++)
            {
                inerArray[j]=new JSONArray();
                if (list1.get(j)%list.get(i)==0)
                    inerArray[j].put(list1.get(j));

            }
innerObject[i].put("Multiplication" , inerArray);

but it does not work

I'm using Java and Restful web service

NaveenG · Accepted Answer · 2015-07-31 11:18:45Z

2

You can try this if it useful for you :-

public static void main(String args[]){
    List<Integer> list1 = new ArrayList<Integer>();
    list1.add(2);
    list1.add(3);
    list1.add(4);
    list1.add(5);
    list1.add(6);
    JSONObject outerObject = new JSONObject();
    JSONArray outerArray = new JSONArray();
    List<Integer> duplicateValue=new ArrayList<Integer>();
    JSONObject [] innerObject = new JSONObject[list1.size()];
            for (int  i = 0; i < list1.size(); i++)// change to list1.size()
                {
                    JSONArray inerArray = new JSONArray();
                    innerObject[i]=new JSONObject();
                    innerObject[i].put("Item" , list1.get(i));
                    if(list1.get(i)%2==0)
                    {
                        innerObject[i].put("Odd or Even", "number "+list1.get(i)+" is even");
                    }
                    else{
                        innerObject[i].put("Odd or Even", "number "+list1.get(i)+" is odd"); 
                    }
                    for (int j=i; j < list1.size(); j++)
                    {
                        if(list1.get(j)!=list1.get(i)){
                            if (list1.get(j)%list1.get(i)==0){
                                    if(!duplicateValue.contains(list1.get(j))){
                                    inerArray.add(list1.get(j));
                                    duplicateValue.add(list1.get(j));
                                }
                            }
                        }
                    }
                    if(inerArray.size()!=0){
                        innerObject[i].put("Multiplication" , inerArray);
                    }
                    outerArray.add(innerObject[i]);
                }

            outerObject.put("rows", outerArray);
            System.out.println(outerObject.toString());
}

OutPut :- {"rows":[{"Item":2,"Odd or Even":"number 2 is even","Multiplication":[4,6]},{"Item":3,"Odd or Even":"number 3 is odd","Multiplication":[6]},{"Item":4,"Odd or Even":"number 4 is even"},{"Item":5,"Odd or Even":"number 5 is odd"},{"Item":6,"Odd or Even":"number 6 is even"}]}

edited Jul 31, 2015 at 11:18

answered Jul 28, 2015 at 5:54

NaveenG

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6 Comments

Hanan Mahmoud Over a year ago

Thank you very much, that was really helpful I modify your code changing inerArray.put instead of inerArray.add, and inerArray.length() instead of inerArray.size() Thanx again

Hanan Mahmoud Over a year ago

can I ask one more question about the same issue? @NaveenG

Hanan Mahmoud Over a year ago

What if the main array list contains duplicated values, such as 2 3 4 4 5 6 6. How can I check the existence of an element before adding it to JSON Array, I mean before this line: inerArray.add(list1.get(j));

Hanan Mahmoud Over a year ago

My idea is to copy JSON array element to hash map, to delete duplication and then copy this hash map back to JSON array, but don't know how to perform that

NaveenG Over a year ago

Yes you can do it, I will update my existing code with your requirement.

|

Pasupathi Rajamanickam · Accepted Answer · 2015-07-28 05:01:24Z

I sorted out your problem. You can try this.

public static void main(String[] args) throws JSONException {
    List<Integer> list1 = new ArrayList<>();
    list1.add(2);
    list1.add(3);
    list1.add(4);
    list1.add(5);
    list1.add(6);
    JSONObject outerObject = new JSONObject();
    JSONArray outerArray = new JSONArray();
    JSONObject[] innerObject = new JSONObject[list1.size()];
    for (int i = 0; i < list1.size(); i++)// change to list1.size()
        {
        innerObject[i] = new JSONObject();
        innerObject[i].put("Item", list1.get(i));
        if (list1.get(i) % 2 == 0) {
            innerObject[i].put("Odd or Even", "number " + list1.get(i) + " is even");
        } else{
            innerObject[i].put("Odd or Even", "number " + list1.get(i) + " is odd");
        }
        //Finding Multiplication
        int currentNumber = list1.get(i);
        String mulitplcationNumbers = "[";
        for(Integer numberFromList : list1){
            if(numberFromList !=currentNumber && numberFromList % currentNumber==0){
                mulitplcationNumbers+=numberFromList + ",";
            }
        }
        if(!mulitplcationNumbers.equals("[")){
            mulitplcationNumbers = mulitplcationNumbers.substring(0, mulitplcationNumbers.length()-1);
            innerObject[i].put("Multiplication", mulitplcationNumbers + "]");
        }
        outerArray.put(innerObject[i]);
    }
    outerObject.put("rows", outerArray);
    System.out.println(outerObject.toString());
}

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