1 class Demo3_Array{
 2     public static void main(String[] args) {
 3         int[] arr1 = new int[3];
 4         int[] arr2 = new int[3];
 5 
 6         System.out.println(arr1);  // 两个不同的地址
 7         System.out.println(arr2);
 8 
 9         arr1[0] = 10;
10         arr2[1] = 20;
11 
12         System.out.println(arr1[0]);
13         System.out.println(arr1[1]);
14         System.out.println(arr1[2]);
15 
16         System.out.println("------------------------------");
17 
18         System.out.println(arr2[0]);
19         System.out.println(arr2[1]);
20         System.out.println(arr2[2]);
21 
22     }
23 }