public class PrintMatrix {

//顺时针打印矩阵

public void clockwisePrint(int[][] matrix) {

if(matrix == null)

return;

int xEnd = matrix.length - 1;

int yEnd = matrix[0].length -1;

int xStart = 0;

int yStart = 0;

while(xStart <= xEnd && yStart <= yEnd) {

printMatrix(matrix, xStart, yStart, xEnd, yEnd);

xStart ++;

yStart ++;

xEnd --;

yEnd --;

}

}

//思路一定要清晰，编程其实考察的还是解决问题的思路，一旦形成清晰的思路，写代码就是很简单的事情了！

public void printMatrix(int[][] matrix, int xStart, int yStart, int xEnd, int yEnd) {

//从左到右打印行

for(int i = yStart; i <= yEnd; i++)

System.out.print(matrix[xStart][i] + " ");

//如果要打印的矩阵不止一行则要从上到下打印列

if(xStart < xEnd) {

for(int i = 1; i <= xEnd; i++) {

System.out.print(matrix[i][yEnd] + " ");

}

//如果要打印的矩阵不止一列从右到左打印

if(yStart < yEnd) {

for(int i = yEnd-1; i >= yStart; i --) {

System.out.print(matrix[xEnd][i] + " ");

}

//如果要打印的矩阵大于2行从下到上打印

if(xEnd - xStart > 1) {

for(int i = xEnd -1; i > xStart; i --) {

System.out.print(matrix[i][yStart] + " ");

}

}

}

}

}

public static void main(String[] args) {

PrintMatrix printMatrix = new PrintMatrix();

int[][] matrix = {{1},{2}};

printMatrix.clockwisePrint(matrix);

}

}