Question

Hello this is just a simple 2d array problem, I’d like to display my 2 array elements in 2 columns like this:

Countries   Cities
Phils          Manila
SK             Seoul
Japan         Tokyo
Israel          Jerusalem

Here is my tried code:

public class ArrayExercise {
    public static void main(String[] args){


        String[][] myArray = {
            {"Philippines", "South Korea", "Japan", "Israel"}, // Countries
            {"Manila", "Seoul", "Tokyo", "Jerusalem" } // capital cities
        };

        System.out.print( "Countries\tCities\n" );

        for( int row = 0; row < myArray.length; ++row ){
            System.out.print( "" );
            for( int col = 0; col < myArray[row].length; ++col ){

                System.out.print( "" + myArray[row][col] + "\t" );

            }
        }
        System.out.println( "" );
    }

}

But I can’t get it to display in 2 columns..Any help is surely appreciated. Thanks guys 🙂

Answer 1

How about iterating col first and then row..

for( int col = 0; col < myArray[0].length; ++col ){
            for( int row = 0; row < myArray.length; ++row ){
                System.out.print(myArray[row][col]);
                System.out.print("\t");
            }
            System.out.println();
        }

Explanation:

Your two dimensional array is like that

• Philippines[0,0] South Korea[0,1] Japan[0,2] Israel[0,3]

• Manila[1,0] Seoul[1,1] Tokyo[1,2] Jerusalem[1,3]

But your wants is here[row, col] is previous index.

• Philippines[0,0] Manila[1,0]
• South Korea[0,1] Seoul[1,1]
• Japan[0,2] Tokyo[1,2]
• Israel[0,3] Jerusalem[1,3]

So iterate outerloop with column.
Inside innerloop, iterate with row and use “\t” to separate.
After inner loop, I print a new line.