java - Sum of 3x3 in 2D-Array -

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write program in java read 2 3 3 matrix , find out sum , display result?

i tried got runtime error 

scanner r=new scanner(system.in);    int [][]array = null;     int[][]array2 = null;   int total=0;   system.out.println("enter matrix");   for(int row=0;row<array.length;row++){       for(int col=0;col<array[row].length;col++){              array[row][col]=r.nextint();               array[row][col]=r.nextint()

;

   system.out.print("   "+total +"  ");        total=array[row][col]+array2[row][col];         system.out.println("   ");

the first for-loop demonstrates how input values in arrays. code require user inputs values of both arrays simultaneously.

the second for-loop demonstrates how sum values of each array. later, both arrays added together.

    //since know the array 3x3,     //declare it!     int[][] array1 = new int[3][3];     int[][] array2 = new int[3][3];      int array1total = 0;     int array2total = 0;     int endresult;      (int x = 0; x < array1.length; x++) {          (int y = 0; y < array1[x].length; y++) {              array1[x][y] = r.nextint();             array2[x][y] = r.nextint();          }     }      (int x = 0; x < array1.length; x++) {          (int y = 0; y < array1[x].length; y++) {              array1total += array1[x][y];             array2total += array2[x][y];          }     }      endresult = array1total + array2total;

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