Two dimension array, how to programically add new array element? Java

Question

I don't know, if I forgot how, or I just can't figure it out how.

For example :

        Object[][] data = {
            {"id", "projectname","valueid", "value"},
        };

And this is how they should be added, but in loop:

        Object[][] data = {
            {"id", "projectname","valueid", "value"},
            {"id2", "projectname2","valueid2", "value2"},
            {"id3", "projectname3","valueid3", "value3"},
        };

And so on..

I need a tip only, like a skeleton how it should be. I tried to figure it out, but had no idea how.

Thanks!

@xander yes, got some information about that, but still not enough. — Ervinas34, Aug 29 '17 at 11:06
http://www.homeandlearn.co.uk/java/multi-dimensional_arrays.html — Master Yoda, Aug 29 '17 at 11:06
Whats wrong with using a hashmap for this if you need to store the keys? — Master Yoda, Aug 29 '17 at 11:08
Look at the answers here --- https://stackoverflow.com/questions/10751603/how-to-insert-values-in-two-dimensional-array-programmaticaly — Pratik K Chatterjee, Aug 29 '17 at 11:10

score 4 · Accepted Answer · answered Aug 29 '17 at 11:08

You can add a new array to another array like this :

data[1] = new Object[]{"id_1", "projectname_1","valueid_1", "value_1"};
...
data[n] = new Object[]{"id_n", "projectname_n","valueid_n", "value_n"};

You can use this way in any loop for example :

int length = 5;
Object[][] data = new Object[length][];
for(int i = 0; i < length; i++){
    data[i] = new Object[]{...some information};
}

score 1 · Answer 2 · edited Aug 29 '17 at 12:08

1

for (int i = 1; i < data.length; i++) {
    for (int j = 0; j < data[i].length; j++) {
        int line = i+1;
        data[i][j] = data[0][j]+ line;
    }
}

edited Aug 29 '17 at 12:08

azro

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answered Aug 29 '17 at 11:30

Imen Gharsalli

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Two dimension array, how to programically add new array element? Java

2 Answers2