字符串简单操作

import java.util.*;

public class Main{
      public static void main(String[] args) {
            Scanner scan=new Scanner(System.in);
            String s=scan.nextLine();//注意输入
            int pos=scan.nextInt();
            int n=scan.nextInt();
            
            char a[] =s.toCharArray();
            char b[]=new char[a.length];
            String ss=s.substring(pos, pos+n);//字符串截取
            
            int k=0;
            for(int i=0;i<pos;i++)  b[k++]=a[i];
            for(int i=pos+n;i<a.length;i++) b[k++]=a[i];
            
            //回文串判断
            int mid=k/2;
            boolean flag=true;
            for(int i=0;i<mid;i++)
                     if(b[i]!=b[k-i-1]){
                              flag=false;
                              break;
                     }

            if(!flag || k==0){
                System.out.println(ss);
            }
            else{
                for(int i=0;i<k;i++) System.out.print(b[i]);
                System.out.println();
            }
    }
}