Question

Write a method that checks whether all elements in a two-dimensional array are identical. This is what I have so far.

int[][] arr1 = {{2, 2, 8}, {1, 6, 4}, {3, 9, 8}, {5, 6, 1}};
       int[][] arr2 = {{7, 7, 7}, {7, 7, 7}, {7, 7, 7}, {7, 7, 7}};
      
       if(matchingVal(array1)) {
           System.out.println("Values in arr1 are the same.");
       }
      
       if(matchingVal(array2)) {
           System.out.println("Values in arr2 are the same.");
       }

Answer 1

Solution :

Explanation : Traverse all the elements of the array and check if every element is equal to the first element i.e the element array[0][0].

Following is the Java code for the same :

public class Main {
    public static boolean matchingVal(int[][] arr) {
  //Assuming all elements are equal to arr[0][0]
  int same = arr[0][0];
  //traverse the 2-d array     
  for (int i=0;i<arr.length;i++)
    for (int j=0;j<arr[0].length;j++)
    
      if(arr[i][j] != same)
        return false;

  return true;
}
    
    public static void main(String args[]) {
       int[][] arr1 = {{2, 2, 8}, {1, 6, 4}, {3, 9, 8}, {5, 6, 1}};
       int[][] arr2 = {{7, 7, 7}, {7, 7, 7}, {7, 7, 7}, {7, 7, 7}};
      
       if(matchingVal(arr1)) {
           System.out.println("Values in arr1 are the same.\n");
       }
       else System.out.println("Values in arr1 are not same.\n");
      
       if(matchingVal(arr2)) {
           System.out.println("Values in arr2 are the same.\n");
       }
       else System.out.println("Values in arr2 are not same.\n");
    }
}

Code demo :

Output :