Write a method that averages all thenumbers in the major diagonal in an n * n matrix of double values using thefollowing header:public static double averageMajorDiagonal(double[][] m)Write a test program that reads a 4-by-4 matrix and displays the average of all itselements on the major diagonal. Here is a sample run: Enter a 4−by−4 matrix row by row:1 2 3 4.0 ↵Enter5 6.5 7 8↵Enter9 10 11 12↵Enter13 14 15 16↵EnterAverage of the elements in the major diagonal is 8.625

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