java二位维数组怎么输入

<code class="java">int rows, cols;
Scanner scanner = new Scanner(System.in);

// 读取行数和列数
System.out.println("Enter the number of rows: ");
rows = scanner.nextInt();
System.out.println("Enter the number of columns: ");
cols = scanner.nextInt();

// 创建二维数组
int[][] arr = new int[rows][cols];

// 逐行输入数组元素
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        System.out.println("Enter element at row " + (i + 1) + ", column " + (j + 1) + ": ");
        arr[i][j] = scanner.nextInt();
    }
}</code>

<code class="java">int[][] arr = {
    {1, 2, 3},
    {4, 5, 6},
    {7, 8, 9}
};</code>

<code class="java">Scanner scanner = new Scanner(new File("array.txt"));

// 读取行数和列数
int rows = scanner.nextInt();
int cols = scanner.nextInt();

// 创建二维数组
int[][] arr = new int[rows][cols];

// 逐行读取数组元素
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        arr[i][j] = scanner.nextInt();
    }
}</code>