Question

public String show(int[] row)
    {
        for(int i = 0; i < row.length; i++)
        {
            JOptionPane.showMessageDialog(null, row[i]);
        }
    }

What is wrong with this code?
I just want to print an array which is given in the parameter.

Answer 1

You could change the return type to void:

public void show(int[] row) {

Also, if you wish to display all elements in the array you could do:

JOptionPane.showMessageDialog(null, Arrays.toString(row));

If a return String is needed the same approach can be used:

return Arrays.toString(row);