一个JAVA题目
设计一个JAVA程序，打印N阶螺旋矩阵：当N=3时，则
1 2 3
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7 6 5
1 public class Ring
2   {
3 public static int getNum(int n,int i,int j)
4  {
5 if(i==0) return j+1;
6 else if(i==n-1)
7 return 3*n-j-2;
8 else if(j==0)
9 return 4*n-i-3;
10 else if(j==n-1)
11 return n+i;
12 else
13 return 4*(n-1)+getNum(n-2,i-1,j-1);
14 }
15 public static void print(int n)
16 {
17 for(int i=0;i<n;i++)
18 {
19 for(int j=0;j<n;j++)
20 System.out.printf("%7d",getNum(n,i,j));
21 System.out.println();
22 }
23 }
24 public static void main(String[] args)
25 {
26 Scanner scan =new Scanner(System.in);
27 while(true)
28 {
29 System.out.println("input a integer(0 to exit):");
30 int n =scan.nextInt();
31 if(n<=0) break;
32 print(n);
33 }
34 }
35 }
1 import java.io.*;
2
3 public class RingDemo{
4
5 public void setArray(int n){
6
7 System.out.println("这是"+n+"个螺线型数组:");
8
9 int intA=1;//初始化
10 int[][] array=new int[n][n];
11
12 int intB;
13
14 if(n%2!=0){
15 intB = n/2+1;//奇数时i循环次数
16 }
17 else
18 intB = n/2;//偶数时i循环次数
19
20 for(int i = 0;i < intB; i++){//从外到里循环
21 //从左到右横的开始
22 for(int j=i;j < n-i; j++){
23 array[i][j] = intA;
24 intA++;
25 }
26 //从上到下纵
27 for(int k=i+1;k < n-i; k++){
28 array[k][n-i-1] = intA;
29 intA++;
30 }
31 //从右到左横
32 for(int l=n-i-2;l >= i ;l--){
33 array[n-i-1][l] = intA;
34 intA++;
35 }
36 //从下到上纵
37 for(int m=n-i-2; m > i ; m--){
38 array[m][i]=intA;
39 intA++;
40 }
41 }
42 //输出数组
43 for(int i = 0; i < n; i++){
44 for(int j = 0; j < n; j++){
45 System.out.print(array[i][j] + " ");
46 }
47 System.out.println();
48 }
49 }
50
51 public static void main(String[] args){
52 String strIn = "";
53 System.out.print("please enter a number:");
54 InputStreamReader input = new InputStreamReader(System.in);
55 BufferedReader buff=new BufferedReader(input);
56 try{
57 strIn=buff.readLine();
58 }
59 catch(IOException e){
60 System.out.println(e.toString());
61 }
62
63 int int1 = Integer.parseInt(strIn);
64 RingDemo ring = new RingDemo();
65 ring.setArray(int1);
66 }
67 }
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