顺时针打印矩阵

/**
 * 沿着边顺时针打印矩阵
 * row 排
 * column 列 
 * @author yitl
 */
public class PrintMatrixInSpiralOrder {

	public static void spiralOrderPrint(int[][] matrix) {
		int a = 0;
		int b = 0;
		int c = matrix.length-1;
		int d = matrix[0].length-1;
		
		while(a <= c && b <= d) {
			printEdge(matrix, a++, b++, c--, d--);
		}
	}
	
	public static void printEdge(int[][] matrix, int a, int b, int c, int d) {
		if(a == c) {
			for(int i = b; i <= d; i++) {
				System.out.print(matrix[a][i]+" ");
			}
		}else if(d == b) {
			for(int i = a; a <= c; i++) {
				System.out.println(matrix[i][b]+" ");
			}
		}else {
			int curC = b;
			int curR = a;
			
			while(curC != d) {
				System.out.print(matrix[a][curC]+" ");
				curC++;
			}
			while(curR != c) {
				System.out.print(matrix[curR][d]+" ");
				curR++;
			}
			while(curC != b) {
				System.out.print(matrix[c][curC]+" ");
				curC--;
			}
			while(curR != a) {
				System.out.print(matrix[curR][b]+" ");
				curR--;
			}
			
		}
	}
	
	public static void main(String[] args) {
		int[][] matrix = { { 1, 2, 3, 4 }, { 5, 6, 7, 8 }, { 9, 10, 11, 12 },{ 13, 14, 15, 16 } };
		spiralOrderPrint(matrix);
	}
	
}