Converting arrays into a multi-dimensional array - Java

Question

is there a way to convert three single dimensional arrays into a multi-dimensional one. For example I have three arrays (text, retweets, geo) how can I merge them so it appears as:-

The arrays I want to merge are something along the lines of text = 'hello, 'hello'. retweets = '2,5' and geo = '19912, 929293'.

And should result in:-

combined = 
[hello, 2, 19912
hello, 5, 929293]

and so one... All of the arrays are the same sizes. I know I should loop through while a for loop somehow but am not quite sure how to implement it.

Thanks to any response.

I tried mucking around with ArrayList's but to no avail

user1840255
– user1840255

2013-02-05 14:31:17 +00:00
Commented Feb 5, 2013 at 14:31 — user1840255
– user1840255, Commented Feb 5, 2013 at 14:31

Mikhail Vladimirov · Accepted Answer · 2013-02-05 14:30:56Z

2

int count = ...;

String [] text = new String [count];
int [] retweets = new int [count];
int [] geo = new int [count];

// Fill arrays with data here

Object [] combined = new Object [count * 3];

for (int i = 0, j = 0; i < count; i++)
{
    combined [j++] = text [i];
    combined [j++] = retweets [i];
    combined [j++] = geo [i];
}

answered Feb 5, 2013 at 14:30

Mikhail Vladimirov

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1 Comment

UmNyobe Over a year ago

this is not a multidimensional array.

Achintya Jha · Accepted Answer · 2013-02-06 07:43:29Z

1

public static void main(String[] args) {

    String[] array1 = { "hello1", "A2", "X19912" };
    String[] array2 = { "hello2", "B2", "Y19912" };
    String[] array3 = { "hello3", "C2", "Z19912" };
    String[] copyArrays = new String[array1.length + array2.length
            + array3.length];
    System.arraycopy(array1, 0, copyArrays, 0, array1.length);
    System.arraycopy(array2, 0, copyArrays, array1.length, array2.length);
    System.arraycopy(array3, 0, copyArrays, array1.length + array2.length,
            array3.length);

    String[][] array = new String[3][3];
    int index = 0;
    for (int i = 0; i < array.length; i++)
        for (int j = 0; j < array[i].length; j++) {
            array[i][j] = copyArrays[index++];
        }

    for (int i = 0; i < array.length; i++) {
        for (int j = 0; j < array[i].length; j++) {

            System.out.print(array[i][j] + "  ");
        }
        System.out.println();
    }
}

Output:

hello1  A2  X19912  
hello2  B2  Y19912  
hello3  C2  Z19912

This code will first copy the given arrays into a new array. Then it will insert all elements of copyArrays into a 2d array using for loop .

edited Feb 6, 2013 at 7:43

answered Feb 5, 2013 at 14:31

Achintya Jha

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2 Comments

user1840255 Over a year ago

Hey Thanks this is along the lines of what I want but the wrong way round. Check my update to the original post. Thanks for your help.

Achintya Jha Over a year ago

@user1840255 You tried my code? You want data to be in table like form ...yes? Table means row & column and my answer is generating 2d . First it copy the given arrays into one and then insert it into 2d array.

isvforall · Accepted Answer · 2013-02-05 14:46:26Z

1

String[] text =...;
int[] retweets =...;
int[] geo =...;

int len = text.length;

List<List<Object>> items = new ArrayList<>();
for (int i = 0; i < len; i++) {
   List<Object> item = new ArrayList<>();
   item.add(text[i]);
   item.add(retweets[i]);
   item.add(geo[i]);
   items.add(item);
}

answered Feb 5, 2013 at 14:46

isvforall

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Comments

stackeroverflower · Accepted Answer · 2016-01-18 03:20:03Z

1

a clever way of "toTableFormTheArrays" is:

public static String[][] to2DArray(String[]... yourArrays){
    return yourArrays;
}

then the code is:
String[] text =  {"hello", "hello"};
String[] retweets = {2, 5};
String[] geo = {19912, 929293};

String[][] yourTableForm2DArray = to2DArray(text, retweets, geo);

note: can change types, multi calls of to2darray for other D, maybe.

answered Jan 18, 2016 at 3:20

stackeroverflower

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Comments

chiwangc · Accepted Answer · 2015-05-02 03:05:48Z

0

String[] text =  {"hello", "hello"};
int[] retweets = {2, 5};
int[] geo = {19912, 929293};

//create table of strings for each array
Object[][] combined = new Object[text.length][3];

//load information into table, converting all information into Strings
for(int row = 0; row<text.length; row++){
    combined[row][0] = text[row];
    combined[row][1] = retweets[row];
    combined[row][2] = geo[row];
}

This creates a multidimensional array that should look like this:

[[hello, 2, 19912], [hello, 5, 929293 ]]

edited May 2, 2015 at 3:05

chiwangc

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answered May 2, 2015 at 2:40

Zanilen

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