Unit 12 - 2D Arrays
Topics:
- 2D arrays
- initialization and traversal
- computations
//
// Hello2DArrays.java
//
public class Hello2DArrays
{
public static double calculateAverage(int[][] values)
{
double total = 0;
int count = 0;
for (int[] row : values)
{
for (int value : row)
{
total += value;
count++;
}
}
return total / count;
}
public static void printArray(int[][] values)
{
for (int[] row : values)
{
for (int value : row)
System.out.print(value + " ");
System.out.println();
}
System.out.println();
}
public static void main(String[] args)
{
System.out.println("Hello, 2D arrays!");
int[][] values = { {1, 3, 5},
{2, 4},
{100, 200, 300} };
for (int i=0; i<values.length; i++)
{
for (int j=0; j<values[i].length; j++)
System.out.print(values[i][j] + " ");
System.out.println();
}
System.out.println();
int[][] values2 = new int[4][4];
// initialize:
// 1 2 3 4
// 1 2 3 4
// 1 2 3 4
// 1 2 3 4
for (int i=0; i<values2.length; i++)
{
for (int j=0; j<values2[i].length; j++)
{
values2[i][j] = j+1;
}
}
printArray(values2);
double result = calculateAverage(values2);
System.out.println("average:" + result);
}
}
