public static String[] reverseIt(String[] array) {
    String[] reverse = new String[array.length];
    for (int i = 0; i < reverse.length; i++)
        reverse[i] = array[array.length - 1 - i];
    return reverse;
}

public static double average(double[] values) {
    double sum = 0.0;
    for (int i = 0; i < values.length; i++)
        sum += values[i];
    return sum / values.length;
}

for (int i = 0; i < word.length; i++) {
    if (word[i] == 'a' || word[i] == 'A')
        word[i] = '@';
    else if (word[i] == 'e' || word[i] == 'E')
        word[i] = '3';
}

public static boolean sameShape(int[][] matrixA, int[][] matrixB) {
      
    // check if # of rows is same 
    if (matrixA.length != matrixB.length) 
        return false; // error 
      	
    // for each row, check if # cols is same 
    for (int row = 0; row < matrixA.length; row++) 
        if (matrixA[row].length != matrixB[row]) 
            return false; // error 
      	
    return true;
}
    

int[][] sum;

// first check that A and B have the same shape
if (sameShape(A, B) { 
    // assume all rows have same number of columns 
    sum = new int[A.length, A[0].length]; 
    
    // compute A + B 
    for (int row = 0; row < A.length; row++) 
        for (int col = 0; col < A[row].length; col++) 
            sum[row][col] = A[row][col] + B[row][col];
}
else 
    System.out.println("Can't add matrices of different sizes");