Java |
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Java has two kinds of arrays:
- single-dimensional
- multi-dimensional or jagged arrays (arrays of arrays).
Note that the declaration has big difference from C#
int[] myIntArray = new int[5]; //create a single-dimensional array
int[] myIntArray = { 2, 4, 6, 8, 10 }; // initialize an array
int[,] myRectangularArray = new int[rows, columns]; //illegal
int[,] myRectangularArray =
{
{0,1,2}, {3,4,5}, {6,7,8}, {9,10,11} //illegal
};
int [,,] array = new int [3, 4, 5];//illegal
int [1,1,1] = 5;//illegal
int [][][] array = new int [3][4][5]; // ok
int [1][1][1] = 5; //ok
class Test
{
public static void main(String[] args) {
int[] a1; // single-dimensional array of int
int[][] a2; // 2-dimensional array of int
int[][][] a3; // 3-dimensional array of int
int[][] j2; // "jagged" array: array of (array of int)
int[][][] j3; // array of (array of (array of int))
}
}
class Test
{
public static void main(String[] args) {
int[] a1 = new int[] {1, 2, 3};
int[][] a2 = new int[][] {{1, 2, 3}, {4, 5, 6}};
int[][][] a3 = new int[10][20][30];
int[][] j2 = new int[3][];
j2[0] = new int[] {1, 2, 3};
j2[1] = new int[] {1, 2, 3, 4, 5, 6};
j2[2] = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9};
}
}
class Test
{
public static void main(String[] args) {
int[] arr = new int[5];
for (int i = 0; i < arr.length; i++)
arr[i] = i * i;
for (int i = 0; i < arr.length; i++)
System.out.println("arr[" + i + "] = " + arr[i]);
}
}
int[][] jag = new int[][] {new int[] {1, 2, 3, 4}, new int[] {5, 6, 7, 8, 9, 10}};
//access elements
for (int i = 0; i < jag.length; i++)
for (int j = 0; j < jag[i].length; j++)
System.out.println(jag[i][j]);
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C# |
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C# has three kinds of arrays:
- single-dimensional
- multi-dimensional rectangular arrays
- jagged arrays (arrays of arrays).
Note that the declaration has big difference from Java
int[] myIntArray = new int[5]; //create a single-dimensional array
int[] myIntArray = { 2, 4, 6, 8, 10 }; // initialize an array
int[,] myRectangularArray = new int[rows, columns]; //create a rectangular array
int[,] myRectangularArray =
{
{0,1,2}, {3,4,5}, {6,7,8}, {9,10,11} //intialize array
};
int [,,] array = new int [3, 4, 5]; // creates a 3x4x5 array
int [1,1,1] = 5;
int [][][] array = new int [3][4][5]; // creates 1+3+12=16 arrays
int [1][1][1] = 5;
class Test
{
static void Main() {
int[] a1; // single-dimensional array of int
int[,] a2; // 2-dimensional array of int
int[,,] a3; // 3-dimensional array of int
int[][] j2; // "jagged" array: array of (array of int)
int[][][] j3; // array of (array of (array of int))
}
}
class Test
{
static void Main() {
int[] a1 = new int[] {1, 2, 3};
int[,] a2 = new int[,] {{1, 2, 3}, {4, 5, 6}};
int[,,] a3 = new int[10, 20, 30];
int[][] j2 = new int[3][];
j2[0] = new int[] {1, 2, 3};
j2[1] = new int[] {1, 2, 3, 4, 5, 6};
j2[2] = new int[] {1, 2, 3, 4, 5, 6, 7, 8, 9};
}
}
class Test
{
static void Main() {
int[] arr = new int[5];
for (int i = 0; i < arr.Length; i++)
arr[i] = i * i;
for (int i = 0; i < arr.Length; i++)
Console.WriteLine("arr[{0}] = {1}", i, arr[i]);
}
}
int[][] jag = new int[][] {new int[] {1, 2, 3, 4}, new int[] {5, 6, 7, 8, 9, 10}};
for (int i = 0; i < jag.Length; i++)
for (int j = 0; j < jag[i].Length; j++)
System.Console.WriteLine(jag[i][j]);
or
for (int i = 0; i < jag.GetLength(0); i++)
for (int j = 0; j < jag[i].GetLength(0); j++)
System.Console.WriteLine(jag[i][j]);
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