1    package bookExamples.ch08ArraysAndVectors.array; 
2     
3    public class Array { 
4        int i[][] = new int[10][10]; 
5     
6        public static void main(String args[]) { 
7            Array a = new Array(); 
8            a.setMainDiagonal(1); 
9            a.print(); 
10           dimTest(); 
11       } 
12    
13       public static void dimTest() { 
14           int ia[][] = new int[10][10]; 
15           int ib[] = new int[10]; 
16           Object o = ia; 
17           if (o instanceof int[][]) 
18               System.out.println("o is 2d"); 
19           if (o instanceof int[]) 
20               System.out.println("o is 1d"); 
21       } 
22    
23       public void setMainDiagonal(int s) { 
24           for (int x = 0; x < i.length; x++) 
25               for (int y = 0; y < i[0].length; y++) 
26                   if (x == y) 
27                       i[x][y] = s; 
28       } 
29    
30       public void print() { 
31           for (int x = 0; x < i.length; x++) { 
32               for (int y = i[0].length - 1; y >= 0; y--) 
33                   System.out.print(i[x][y] + " "); 
34               System.out.println(); 
35           } 
36       } 
37   }