Can I store a 1d array into a 2d array in java?

Question

I was coding midway when I find out that netbeans give me an error regarding the below code:

String [][]table={getRowArray()};
//getRowArray() will return me a 1D string array

Is there any way to store the 1D array returned by my method into the 2D array directly instead of using a for loop? Thanks for any help rendered!

can give something like this-- String [][]table={getRowArray(), 0}; — Addicted
– Addicted, Commented May 22, 2012 at 4:22
Return type is mentioned in the comment after array statement. — Ravinder Reddy
– Ravinder Reddy, Commented May 22, 2012 at 4:41
@Ravinder - What it returns and what it is declared to return can be two different things. — Ted Hopp
– Ted Hopp, Commented May 22, 2012 at 6:30

Makoto · Accepted Answer · 2012-05-22 04:24:33Z

2

For starters - yes, it is possible to do that.

public class Test {
    public String[] dum() {
        String[] x = {"Not sure"};
        return x;
    }

    public static void main(String[] args) {
        Test t = new Test();
        String[][] words = {t.dum()};
        System.out.println(words[0][0]); // prints "Not sure"
    }
}

Double check the error you're getting. Make certain that the return type of getRowArray() is truly String[].

answered May 22, 2012 at 4:24

Makoto

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Comments

Ken W · Accepted Answer · 2012-05-22 04:17:29Z

0

There may be a better solution for this, but I believe you need to specify a single index for one of the dimensions in order to store it, so you're storing the 1-d Array into a single index of the first-dimension.

i.e.

String [][]table;
table[0] = getRowArray();

this should work since the first dimension of the array stores other arrays

answered May 22, 2012 at 4:17

Ken W

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4 Comments

cheeken Over a year ago

This almost works - but you'll need to initialize table first.

Ted Hopp Over a year ago

If this were to work (after initializing table so table[0] doesn't generate a NPE), then OP's original code would work. I suspect that the return type of getRowArray() is something other than String[].

Ravinder Reddy Over a year ago

@TedHopp - OP clearly said //getRowArray() will return me a 1D string array

Ted Hopp Over a year ago

@Ravinder - It might return a 1D string array but still have return type Object[].

Ravinder Reddy · Accepted Answer · 2012-05-22 04:34:48Z

0

String [] oneD = { "1", "2", "3", "4" }; // getRowArray();
String [][] twoD1 = { oneD };
String [] anotherOneD = null; // or filled
String [][] twoD2 = { oneD, anotherOneD };
String [][] twoD3 = new String[][] { oneD };
String [][] twoD4 = new String[][] { oneD, anotherOneD };

answered May 22, 2012 at 4:34

Ravinder Reddy

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