For instance, give row = 4, col = 5, print matrix in zigzag order like:

[1, 8, 9, 16, 17]
[2, 7, 10, 15, 18]
[3, 6, 11, 14, 19]
[4, 5, 12, 13, 20]

 1 package GooglePhone;
 2 
 3 import java.util.Arrays;
 4 
 5 public class PrintMatrix {
 6 
 7     static void print(int rows, int cols) {
 8         int limit = rows * cols;
 9         int T = rows * 2; // cycle
10         for (int i=1; i<=rows; i++) {
11             int[] curRow = new int[cols];
12             int k = 0;
13             int index = 0;
14             while (k * T + i <= limit || k * T + T - i + 1 <= limit) {
15                 if (k * T + i <= limit) curRow[index++] = k * T + i;
16                 if (k * T + T - i + 1 <= limit) curRow[index++] = k * T + T - i + 1;
17                 k++;
18             }
19             System.out.println(Arrays.toString(curRow));
20         }
21         
22     }
23     /**
24      * @param args
25      */
26     public static void main(String[] args) {
27         // TODO Auto-generated method stub
28         print(4, 5);
29         //print(3, 5);
30     }
31 
32 }