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python/python web (bash shell) | 嵌入式

java - day08 - ArrayFounderTrans

 1 package day07_addition;
 2 import java.util.Arrays;
 3 import java.util.Random;
 4 
 5 //数组 伸缩、增删、位移、复制
 6 public class ArrayFounderTrans {
 7     public static void main(String[] args){
 8         int[] a = new int[6];
 9         Random rand = new Random();
10         
11         //初始化数组a[]
12         for(int i=0;i<a.length;i++){
13             a[i] = (int)(rand.nextInt(100));   /* a[i] = (int)(Math.random()*100); */
14             System.out.print(a[i]+" ");
15         }
16         System.out.println();
17         
18         /*
19          * 
20         //数组缩进a[6]-->a[5]
21         a = Arrays.copyOf(a, 5);
22         for(int i=0;i<a.length;i++){
23             System.out.print(a[i]+",");
24         }
25         */
26         
27         System.out.println("去掉第3个因素");
28                         
29         //方法1 复制:复制第4个元素及后面的元素,实现删除第3个元素
30         int[] a1 = new int[5];
31         int n = 3;
32         System.arraycopy(a, 0, a1, 0, n-1);
33         System.arraycopy(a, n, a1, n-1, a.length-n);
34         for(int i=0;i<a1.length;i++){
35             System.out.print(a1[i]+" ");
36         }
37         
38         /*
39          * 
40         //方法2  数组按位交换,然后去掉最后元素,实现删除目标元素
41         int temp;
42         
43 44         //从第3个元素开始移位
45         for(int i=3;i<a.length-1;i++){
47 temp = a[i];
         a[i] = a[i+1];
a[i+1] = temp;  
48 } 49 */ 50 } 51 }

 

数组伸缩

 

posted on 2017-05-02 16:09  落羽生  阅读(118)  评论(0编辑  收藏  举报

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