public class IrregularArray {
    public static void main(String[] args) {
        int[][] arr = new int[2][];//声明arr参考的对象会有两个参考
        arr[0] = new int[]{1, 2, 3, 4, 5};
        arr[1] = new int[]{1, 2, 3};
        for (int[] row : arr) {
            for (int value : row) {
                System.out.printf("%2d", value);
            }
            System.out.println();
        }
    }
}