Question

I’ve to create from Java a JSON structure like this one:

[ [ timestamp , number ],[ timestamp , number ] ]

for using it on Highcharts graphs.

I’ve used a “LinkedList of LinkedList” structure that I’ve found formatting in json in the same way, and it works.

I wished to know if there’s another way to do it.
A LinkedList of LinkedList sounds weird..

EDIT:

Maybe the question wasn’t clear.
I’m not asking how to convert the array-of-arrays in json but WHAT to convert.

In my case I know the result of the conversion and I can choose the starting structure.
Other structures, instead of “LinkedList of LinkedLists” that json-ized are like this:

[ [ x, y ] , [ z, k ] , … ]

Answer 1

If u dont want to use any collection class then by simply using following code u can make the string required to u for JSON.In following code u can keep the num variable value dynamic.

StringBuilder sb = new StringBuilder();
        sb.append("[");
        int num = 5;
        for(int i=0;i<num;i++)
        {
            sb.append("[");
            sb.append(new Date().getTime() + "," + (i+1));
            sb.append("]");
            if((i+1)<num)
                sb.append(",");
        }
        sb.append("]");