在命令行输入一个自然数N,实现螺旋排列

仅作为笔记,仅供参考

public class Test {


    public static void main(String[] args) {

       /* String inputNum = "3";
        if ("3".equals(inputNum)) {
            System.out.println("01 02 03");
            System.out.println("08 09 04");
            System.out.println("07 06 05");
        }
        if ("6".equals(inputNum)) {
            System.out.println("01 02 03 04 05 06");
            System.out.println("20 21 22 23 24 07");
            System.out.println("19 32 33 34 25 08");
            System.out.println("18 31 36 35 26 09");
            System.out.println("17 30 29 28 27 10");
            System.out.println("16 15 14 13 12 11");
        }*/
        final int INPUT_NUMBER = 6;
        //0=右 1=下 2=左 3=上
        int direction = 0;
        int directionCount=0;
        int xLine = 0;
        int yLine = 0;
        int[][] intArray = new int[INPUT_NUMBER][INPUT_NUMBER];

        //初始化
        for (int x = 0; x < INPUT_NUMBER; x++) {
            for (int y = 0; y < INPUT_NUMBER; y++) {
                intArray[x][y] = 0;
            }
        }
        for (int x = 1; x <= INPUT_NUMBER * INPUT_NUMBER; x++) {
            switch (direction) {
                case 0:
                    if (yLine + 1 >= INPUT_NUMBER || (directionCount>=3 && intArray[xLine][yLine+1] > 0)) {
                        direction = ++direction % 4;
                        directionCount++;
                        intArray[xLine][yLine] = x;
                        xLine++;
                    } else {
                        intArray[xLine][yLine] = x;
                        yLine++;
                    }
                    break;
                case 1:

                    if (xLine + 1 >= INPUT_NUMBER || (directionCount>=3 && intArray[xLine+1][yLine] > 0)) {
                        direction = ++direction % 4;
                        directionCount++;
                        intArray[xLine][yLine] = x;
                        yLine--;
                    } else {
                        intArray[xLine][yLine] = x;
                        xLine++;
                    }
                    break;
                case 2:

                    if (yLine == 0 || (directionCount>=3 && intArray[xLine][yLine-1] > 0)) {
                        direction = ++direction % 4;
                        directionCount++;
                        intArray[xLine][yLine] = x;
                        xLine--;
                    } else {
                        intArray[xLine][yLine] = x;
                        yLine--;
                    }
                    break;
                case 3:

                    if (xLine== 0 || (directionCount>=3 && intArray[xLine-1][yLine] > 0)) {
                        direction = ++direction % 4;
                        directionCount++;
                        intArray[xLine][yLine] = x;
                        yLine++;
                    } else {
                        intArray[xLine][yLine] = x;
                        xLine--;
                    }
                    break;
            }
        }

        //打印
        System.out.println("***********************");
        for (int a = 0; a < INPUT_NUMBER; a++) {
            for (int b = 0; b < INPUT_NUMBER; b++) {
                System.out.print(" " + Test.padRight(String.valueOf(intArray[a][b]),5,'0'));
            }
            System.out.println(" ");
        }

    }
    /**
     * String右对齐
     *  前补位
     * @author
     */
    public static String padRight(String src, int len, char ch) {
        int diff = len - src.length();
        if (diff <= 0) {
            return src;
        }

        char[] charr = new char[len];
        System.arraycopy(src.toCharArray(), 0, charr, diff, src.length());
        for (int i = 0; i < diff; i++) {
            charr[i] = ch;
        }
        return new String(charr);
    }
}

结果

***********************
 00001 00002 00003 00004 00005 00006 
 00020 00021 00022 00023 00024 00007 
 00019 00032 00033 00034 00025 00008 
 00018 00031 00036 00035 00026 00009 
 00017 00030 00029 00028 00027 00010 
 00016 00015 00014 00013 00012 00011