ARRAYS - Java Programming: From Problem Analysis to Program Design - page 600

In the section, Processing Two-Dimensional Arrays, we described various algorithms to
process the elements of a two-dimensional array. Using those algorithms, we can write
methods that can be used in a variety of applications. In this section, we write some
of these methods. For simplicity, we assume that we are processing the entire two-
dimensional array.
The following method outputs the elements of a two-dimensional array, one row per
line:

public static void printMatrix( int [][] matrix)
{

for ( int row = 0; row < matrix.length; row++)
{

for ( int col = 0; col < matrix[row].length; col++)
System.out.printf("%7d", matrix[row][col]);

System.out.println();

}

}

Similarly, the following method outputs the sum of the elements of each row of a two-
dimensional array whose elements are of type int :

public static void sumRows( int [][] matrix)
{

int sum;

//sum of each individual row
for ( int row = 0; row < matrix.length; row++)
{

sum = 0;

for ( int col = 0; col < matrix[row].length; col++)
sum = sum + matrix[row][col];

System.out.println("The sum of the elements of row "
+ (row + 1) + " = " + sum);

}

}

The following method determines the largest element in each row:

public static void largestInRows( int [][] matrix)
{

int largest;

//The largest element in each row
for ( int row = 0; row < matrix.length; row++)