package 練習題;

public class Matrix1 {  // 轉圈打印矩陣一個框一個框的打印
    public static void printMatrix(int[][] arr) {
        int a=0;
        int b=0;
        int c=arr.length-1;
        int d=arr[0].length-1;
        while(a <= c && b <= d) {  // 假如只給你一列數(shù)或一行數(shù)是邊界的處理
            printProcess(arr, a++, b++, c--, d--);
        }
    }
    
    public static void printProcess(int[][] arr, int a, int b, int c, int d) {
        int a1 = a;
        int b1 = b;
        if(a1 == c) {   // 只給一列數(shù)時
            while(b1 <= d) {
                System.out.println(arr[a1][b1++] + " ");
            }
        }else if(b1 == d){ // 一行數(shù)時
            while(a1 <= c) {
                System.out.println(arr[a1][b1]+ " ");
                a1++;
            }
        }else {
            while(b1 != d) { 
                // 這四個while和上面兩個的區(qū)別是這里每一行或者每一列的最后的點總是由下一個while來打印
                // 如果換成<=的話每行每列的最后的點就打不出來了
                System.out.println(arr[a][b1]+ " ");
                b1++;
            }
            while(a1 != c) {
                System.out.println(arr[a1][d]+ " ");
                a1++;
            }
            while(b1 != b) {
                System.out.println(arr[c][b1]+ " ");
                b1--;
            }
            while(a1 != a) {
                System.out.println(arr[a1][b]+ " ");
                a1--;
            }
        }
    }
    
    public static void main(String[] args) {
        int[][] matrix = {
            {1, 2, 3, 4},
            {5, 6, 7, 8},
            {1, 2, 3, 4},
            {7, 8, 9, 0}
            
        };
        printMatrix(matrix);
    }
}