Java中数组的插入，删除，扩张

 1 package cn.hst.hh;
 2 
 3 import java.util.Scanner;
 4 
 5 /**
 6  * 
 7  * @author Trista
 8  *
 9  */
10 public class TestArrayCopy {
11     public static void main(String[] agrs) {
12         Scanner a = new Scanner(System.in);
13         System.out.println("请输入数组（注意空格）：");
14         String s = a.nextLine();
15         String[] s1 = s.split(" "); //拆分字符串成字符串数组
16         System.out.println("请输入你要插入的元素的个数：");
17         int n = a.nextInt();
18         System.out.println("请输入你要插入的位置：");
19         int index = a.nextInt();
20         s1 = addArray(s1,n,index);
21         print1(s1);
22         
23 //        System.out.println("请输入需要扩大元素的个数：");
24 //        int n = a.nextInt();
25 //        s1 = extendArray(s1,n);
26 //        print1(s1);
27 //        
28 //        System.out.println("请输入你要删除元素的位置：");
29 //        int n = a.nextInt();
30 //        s1 = delArray(s1,n);
31 //        print1(s1);
32         }
33     
34 
35 //扩张数组，n为扩大多少个
36 public static String[] extendArray(String[] a,int n) {
37     String[] s2 = new String[a.length+n];
38     System.arraycopy(a,0, s2, 0, a.length);
39     return s2;
40   }
41  //删除数组中指定索引位置的元素，并将原数组返回
42 public static String[] delArray(String[] b,int index) {
43     System.arraycopy(b, index+1, b, index, b.length-1-index);
44     b[b.length-1] = null;
45     return b;
46 }
47 
48 //插入元素
49 public static String[] addArray(String[] c,int n,int index) {
50     String[] c1 = new String[c.length+n];
51     String[] a1 = new String[n];
52     if(index==0) {
53         System.arraycopy(c, 0, c1, n, c.length);
54     }else if(index==c.length) {
55         System.arraycopy(c,0,c1,0,c.length);
56 
57     }else {
58         System.arraycopy(c,0,c1,0,index);
59         System.arraycopy(c,index,c1,index+n,c.length-index);
60 
61     }
62     a1 = getElement();
63     for(int i=0;i<n;i++) {
64         c1[index+i]=a1[i];
65     }
66     return c1;
67 }
68 
69 //打印结果
70 public static void print1(String[] c1) {
71     for(int i=0;i<c1.length;i++) {
72         System.out.print(i+":"+c1[i]+" ");
73     }
74     System.out.println();
75 }
76 
77 //获取需要插入的元素
78 public static String[] getElement() {
79     Scanner b1 = new Scanner(System.in);
80     System.out.println("请输入需要插入的元素(注意空格)：");
81     String a = b1.nextLine();
82     String[] a1 = a.split(" ");
83     return a1; 
84 }
85 }