Question

The last element in each array in a 2D array is incorrect. It’s your job to fix each array so that the value 0 is changed to include the correct value.

In the first array, the final value should be the length of the first array.

In the second array, the final value should be the sum of the first value, and the second to last value in the array.

In the third array, the final value should be the length of the 2D array.

Create a method called fixArray(int[][] array, int row, int col, int value) that sets the [row][column] to the correct value. Then, call the fixArray method three times - once for each value change that you are supposed to make.

When inputting values to fixArray, you will have to hard code the row value, but the column value and the new value should be set using the array accessor methods. For example, if we wanted to set the value of the first index in the first array to the length of the 2D array, we would write:

fixArray(array, 0, 0, array.length)

public class ArrayPractice

{

public static void main(String[] args)

{

int[][] array = {{5, 4, 2, 1, 0}, {523, 63, 2342, 586, 1, 6534, 0}, {10, 9, 2, 0}};

//Call the fixArray method three times on this array:

  

  

  

print(array);

}

  

//Create a method to add the correct value to the array at the correct col, row

public static void fixArray(int[][] arr, int row, int col, int value)

{

  

}

  

  

  

//Do not make alterations to this method!

public static void print(int[][] array)

{

for(int[] row: array)

{

for(int num: row)

{

System.out.print(num + " ");

}

System.out.println();

}

}

}

Answer 1

Note : I have comment out the code , where i thought necessary for you to understand it well.So refer to commented part if any issue in getting code.

**************************************** DRIVER CLASS (ArrayPractice.java - file) *****************************************************

import java.util.Scanner;
public class ArrayPractice {

   public static void main(String[] args) {
      
       int[][] array = {{5, 4, 2, 1, 0}, {523, 63, 2342, 586, 1, 6534, 0}, {10, 9, 2, 0}};
      
      
       // length of first array stored in 2D array will calculated with the help of reference of that
       // first array stored at array[0] (i.e 0th index of array) so it is calculated as
       // (array[0].length)
fixArray(array,0,array[0].length-1,array[0].length);
  
// length of second array stored in 2D array will calculated with the help of reference of that
// second array stored at array[1] (i.e 1th index of array) so it is calculated as
// (array[1].length) and , first element of that second array will be : array[1][0]
// second element last of that second array of 2D array will be : array[1][array[1].length-2]
fixArray(array,1,array[1].length-1,array[1][0]+array[1][array[1].length-2]);
  
//Length of whole 2D array will be no. array's references stored in 2D array
// this will be calculated by ( array.length ) directly
fixArray(array,2,array[2].length-1,array.length);
  
print(array);
      

   }
  
  
   public static void fixArray(int[][] arr, int row, int col, int value)
   {
   arr[row][col]=value;
   }
  
   public static void print(int[][] array)
   {
   for(int[] row: array)
   {
   for(int num: row)
   {
   System.out.print(num + " ");
   }
   System.out.println();
   }
   }

****************************************** CONSOLE (Sample input/output) *********************************************************

5 4 2 1 5
523 63 2342 586 1 6534 7057
10 9 2 3

******************************************************************************************************************************************

I have also attach a pictorial view of example array , so refer to that image , Hope u will be more clear with the 2D array concept.

Thanks.

}