java值传递与引用传递实例

 1 public class Test2 {
 2
 3     public static void main(String[] args) {
 4         int[] arr=new int[5];
 5         arr[0]=10;
 6         arr[1]=20;
 7
 8         change(arr);
 9         System.out.println("5:"+arr[0]);//10
10         System.out.println("6:"+arr[1]);//30
11         System.out.println("7:"+arr[2]);//89
12         System.out.println("8:"+arr[3]);//0
13         System.out.println("9:"+arr[4]);//0
14     }
15     public static void change(int[] arr){
16         arr[1]=30;
17         arr[2]=89;
18         arr=new int[5];
19         arr[0]=300;
20         arr[1]=900;
21         arr[2]=87;
22         arr[3]=67;
23         arr[4]=74;
24         System.out.println("0:"+arr[0]);//300
25         System.out.println("1:"+arr[1]);//900
26         System.out.println("2:"+arr[2]);//87
27         System.out.println("3:"+arr[3]);//67
28         System.out.println("4:"+arr[4]);//74
29     }
30
31 }