我可以在Java中将1d数组存储到2d数组中吗？

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!

Answer 1

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[] .

Answer 2

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.

ie

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

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

Answer 3

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 };