Java算法--第四章--多维数组和矩阵（1）顺时针打印二维数组

Java算法–第四章–多维数组和矩阵（1）顺时针打印二维数组

代码：

package matrix;

public class Print20Arr {
	public static void main(String[] args) {
		int[][] matrix = { { 1, 2, 3, 4, 5 }, { 6, 7, 8, 9, 10 }, { 11, 12, 13, 14, 15 }, { 16, 17, 18, 19, 20 },
				{ 21, 22, 23, 24, 25 } };
		print(matrix);

	}

	static void print(int[][] matrix) {
		int r = 0, leftUpRow = 0;
		int c = 0, leftUpCol = 0;
		int rightDownRow = matrix.length - 1;
		int rightDownCol = matrix[0].length - 1;
		while (leftUpRow <= rightDownRow && leftUpCol <= rightDownCol) {
			// 上面一行
			while (c <= rightDownCol) {
				System.out.print(matrix[r][c++] + " ");
			}
			// 恢复
			c = rightDownCol;
			r++;
			// 右边一列
			while (r <= rightDownRow) {
				System.out.print(matrix[r++][c] + " ");
			}
			// 恢复
			r = rightDownRow;
			c--;
			// 下面一边
			while (c >= leftUpCol) {
				System.out.print(matrix[r][c--] + " ");
			}
			// 恢复
			c = leftUpCol;
			r--;
			while (r > leftUpRow) {
				System.out.print(matrix[r--][c] + " ");
			}
			leftUpRow++;
			leftUpCol++;
			rightDownRow--;
			rightDownCol--;
			c = leftUpCol;
			r = leftUpRow;
		}
	}
}

输出：

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