cara bikin coding matrik

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication11;

/**
 *
 * @author dwi
 */
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Scanner;
public class JavaApplication11 {
    private static int i;
    private static int j;
    private static String[][] jumlahMatrix;
    private static String[][] kurangMatrix;
    private static String[][] matrixA;

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        //System.out.println("1.hasil ");
       
        System.out.println("");
        Scanner input = new Scanner(System.in);
       
        int i;
        int j;
        int[][]matrixA = new int[2][2];
        int[][]matrixB = new int[2][2];
        int[][]jumlahMatrix = new int[2][2];
        int[][]kurangMatrix= new int[2][2];
       



//input matrix A

        for(i=0;i<2;i++)
        {
            for(j=0;j<2;j++)
            {
                System.out.print("matrix A [" + i + "].[" + j + "]= ");
                matrixA[i][j] =input.nextInt();
            }
        }

        System.out.println();

// input matrix B
        for(i=0;i<2;i++)
        {
            for(j=0;j<2;j++)
            {
                System.out.print("matrix B[" + i + "].[" + j + "]= ");
                matrixB[i][j] =input.nextInt();
            }
        }

        BufferedReader dataIn = new BufferedReader (new InputStreamReader(System.in));

        int pilih = 0;
        System.out.print("masukan angka 1 kemudian enter : ");
        try{

            pilih = Integer.parseInt(dataIn.readLine());
        }
        catch(IOException e){
           
        }

        switch(pilih){
            case 1:
                System.out.println("\nhasil");
                //penjumlahan Matrix

        for(i=0;i<2;i++)
        {
            for(j=0;j<2;j++)
            {
              jumlahMatrix[i][j] = matrixA[i][j] + matrixB[i][j];
                kurangMatrix[i][j] = matrixA[i][j] - matrixB[i][j];  
            }
        }

        System.out.println("\npenjumlahan\n");
        for(i=0;i<2;i++)
        {
            for(j=0;j<2;j++)
            {
                System.out.print(" " + jumlahMatrix[i][j]);
            }
        
System.out.println();
        }
        System.out.println("\npengurangan\n");
        for(i=0;i<2;i++)
        {
            for(j=0;j<2;j++)
            {
                System.out.print(" " + kurangMatrix[i][j]);
            }
            System.out.println();
        }


    }
    }
}