将字符串插入到另一个字符串的指定位置（串）

 1 import java.util.Scanner;
 2 
 3 
 4 public class Main 
 5 {
 6     public static void main(String args[])
 7     {
 8         int n=0;
 9         Scanner scan=new Scanner(System.in);
10         String t=scan.next();
11         String s=scan.next();
12         n=scan.nextInt();
13         StringBuffer stringbuffer=new StringBuffer(s);
14         s=stringbuffer.insert(n, t).toString();
15         System.out.println(s);
16         
17     }
18 }