Java中的Jagged数组

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  Java 数组

Java中的Jagged数组

Jagged数组是数组的数组，这样成员数组的大小可以不同，也就是说，我们可以创建一个二维数组，但每行的列数都是可变的。这些类型的数组也被称为Jagged数组。

以下是展示上述概念的Java程序。

// Program to demonstrate 2-D jagged array in Java
class Main
{
    public static void main(String[] args)
    {
        // Declaring 2-D array with 2 rows
        int arr[][] = new int[2][];
 
        // Making the above array Jagged
 
        // First row has 3 columns
        arr[0] = new int[3];
 
        // Second row has 2 columns
        arr[1] = new int[2];
 
        // Initializing array
        int count = 0;
        for (int i=0; i<arr.length; i++)
            for(int j=0; j<arr[i].length; j++)
                arr[i][j] = count++;
 
        // Displaying the values of 2D Jagged array
        System.out.println("Contents of 2D Jagged Array");
        for (int i=0; i<arr.length; i++)
        {
            for (int j=0; j<arr[i].length; j++)
                System.out.print(arr[i][j] + " ");
            System.out.println();
        }
    }
}

输出：

Contents of 2D Jagged Array
0 1 2 
3 4

以下是i行有i列的另一个例子，即第一行有1个元素，第二行有两个元素，依此类推。

// Another Java program to demonstrate 2-D jagged
// array such that first row has 1 element, second
// row has two elements and so on.
class Main
{
    public static void main(String[] args)
    {
        int r = 5;
 
        // Declaring 2-D array with 5 rows
        int arr[][] = new int[r][];
 
        // Creating a 2D array such that first row
        // has 1 element, second row has two
        // elements and so on.
        for (int i=0; i<arr.length; i++)
            arr[i] = new int[i+1];
 
        // Initializing array
        int count = 0;
        for (int i=0; i<arr.length; i++)
            for(int j=0; j<arr[i].length; j++)
                arr[i][j] = count++;
 
        // Displaying the values of 2D Jagged array
        System.out.println("Contents of 2D Jagged Array");
        for (int i=0; i<arr.length; i++)
        {
            for (int j=0; j<arr[i].length; j++)
                System.out.print(arr[i][j] + " ");
            System.out.println();
        }
    }
}

输出：

Contents of 2D Jagged Array
0 
1 2 
3 4 5 
6 7 8 9 
10 11 12 13 14

  Java 数组

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