Java循环数组模式

Question

我想知道是否可以就以下问题获得一些帮助。我需要创建一个以某种格式显示其输出的数组，但我似乎无法弄清楚如何真正让它这样做。这种模式有点难以用语言解释，所以我附上了一张可以展示它的图片。

下面提供的代码以下列方式显示输出：根据用户输入的数字，假设他们输入了 4，输出将是以下 4x4 数组：

1 2 3 4

8 7 6 5

9 10 11 12

16 15 14 13

这显然不是我想要实现的模式..所以任何帮助将不胜感激！

公开课第二题{

public static void main(String[] args) {

//declare scanner
    Scanner keyboard = new Scanner (System.in);

//Prompt user to enter a digit greater than or equal to 3
    System.out.println("How many rows/columns do you want your array to have? (Must be at least 3):");

//read user input
    int num = keyboard.nextInt();

//place constraints on int num so that if it is less than 3, the program does not execute
    while(num<3 )
    {
        System.out.println("Lets's try this again....");
        System.out.println("How many rows/colums do you want your array to have? (Must be at least 3):");
        num = keyboard.nextInt();   
    }

    //2D array with number of rows and columns entered by user
    int[][] array = new int [num][num];
    int inc=1;

    for(int i=0;i<array.length;i++)
    {
        if(i%2 == 0){
            for(int j=0;j<array.length;j++)
            {
                array[i][j]=inc;
                inc++;
            }
        }
        else{
            for(int j=num-1;j>=0;j--)
            {
                array[i][j]=inc;
                inc++;
            }
        }
    }

            //display formatted output 
    String [][]stringConvertedTable= new String[num][num];

    for(int i=0; i<num; i++) {
        for(int j=0; j<num; j++) {
            stringConvertedTable[i][j]= Integer.toString(array[i][j]);
            System.out.print(stringConvertedTable[i][j] + "\t");
        }
        System.out.println("");

Answer 1

你可以通过对数组大小应用取模运算符来实现计数器的换行

result[i][(k+i)%size] = counter++;

这个怎么样？

    final int size = 5;
    int[][] result = new int[size][size];

    //the logic
    int counter = 1;
    for(int i = 0; i < size; i++) {
        for(int k = 0; k < size; k++) {
            result[i][(k+i)%size] = counter++;
        }
    }

    //just the output
    for(int i = 0; i < size; i++) {
        boolean isFirst = true;
        for(int k = 0; k < size; k++) {
            if(isFirst)
                isFirst = false;
            else
                System.out.print(", ");
            System.out.print(result[i][k]);
        }
        System.out.println();
    }

输出

1, 2, 3, 4, 5
10, 6, 7, 8, 9
14, 15, 11, 12, 13
18, 19, 20, 16, 17
22, 23, 24, 25, 21