initialize a multidimentional array using inbuilt string in java

Question

I have a string something like:

String someString=[[((2016, 5, 21, 2, 0, 0), (2016, 5, 23, 7, 0, 0)), [('TASK1', 'DONE'), ('TASK2', 'DONE'), ('TASK3', 'DONE'), ('TASK4', 'DONE'), ('TASK5', 'DONE')]]]

I want to use this string to initialize a multidimensional array so that i can retrieve the values using indexes:

array[0] should give ((2016, 5, 21, 2, 0, 0), (2016, 5, 23, 7, 0, 0)) array[0][1] should give (2016, 5, 23, 7, 0, 0) and so on ..

In python, I was able to do it easily using the eval function but not sure how to do it in Java.

Have a look at Is there a java equivalent of the python eval function? and Is there an eval() function in Java? — Sasha
– Sasha, Commented May 24, 2016 at 10:08
@Sasha.. i already saw that post but didn't find much help there .. — Ranjan Kumar
– Ranjan Kumar, Commented May 24, 2016 at 10:16
@Cataclysm .. Using delimiter here is not something i am looking for here .. — Ranjan Kumar
– Ranjan Kumar, Commented May 24, 2016 at 10:17

Poh Zi How · Accepted Answer · 2016-05-24 10:22:48Z

0

What you are looking for seems to be a 3-dimensional array. Declare the array by adding three square brackets, and use curly braces to signify the end of each array. For example:

String someString [][][] = {
            {{"2016", "5", "21", "2", "0", "0"},{"2016", "5", "23", "7", "0", "0"}},
            {{"TASK1", "DONE"}, {"TASK2", "DONE"}}
            };

In this case, someString[0][0][0] will be 2016, and someString[1][1][0] will be TASK2, etc.

Displaying an array in java is slightly more complicated than python, where the standard way is to use multiple for loops to go through each array. For example:

        for (int h=0; h<someString.length; h++){
        for (int i=0; i<someString[h].length; i++){
            System.out.print(someString[h][i][0] + "\t");
            for (int j=0; j<someString[h][i].length; j++){
                System.out.print(someString[h][i][j]+"\t");
            }
            System.out.println();
        }
    }

answered May 24, 2016 at 10:22

Poh Zi How

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2 Comments

Ranjan Kumar Over a year ago

This example will work when i can declare my own string array but i am getting a string instead of string array so how do i convert that string to the 3D string array you mentioned ??

Pradhan Over a year ago

In that case you will have to write code to parse the string and create multi-dimensional arrays yourself. There is no direct way of doing this. Post the exact format of the string or a couple of sample strings. May be we can come up with a simple algo.

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