Java 8 coding challenge: Addition ain’t simple

Jack is awesome. His friends call him little Einstein. To test him, his friends gave him a string. They told him to add the string with its reverse string and follow these rules:

  1. Every ith character of string will be added to every ith character of reverse string.
  2. Both string will contain only lower case alphabets(a-z).
  3. Eg:- a+a=b,a+c=d,z+a=a (Refer to sample test cases for more details)

Input:

First line contains a value N denoting number of test cases. Next N lines contains string str.

Output:

For every string str output the string that Jack’s friends wants from him.

Constraints

1 <= N <= 10

1 <= str <= 10^5

SAMPLE INPUT
4
hello
codeapocalypse
programming
world
SAMPLE OUTPUT
wqxqw
hhtdmqrrqmdthh
wfxtebetxfw
aajaa

Code:

import java.io.*;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.Map;
 

public class AdditionAintSimple {
 static class Print {
 private final BufferedWriter bw;
 
 public Print() {
 this.bw = new BufferedWriter(new OutputStreamWriter(System.out));
 }
 
 public void print(Object object) throws IOException {
 bw.append("" + object);
 }
 
 public void println(Object object) throws IOException {
 print(object);
 bw.append("\n");
 }
 
 public void close() throws IOException {
 bw.close();
 }
 }
 
 static class Reader
 {
 final private int BUFFER_SIZE = 1 << 16;
 private DataInputStream din;
 private byte[] buffer;
 private int bufferPointer, bytesRead;
 
 public Reader()
 {
 din = new DataInputStream(System.in);
 buffer = new byte[BUFFER_SIZE];
 bufferPointer = bytesRead = 0;
 }
 
 public Reader(String file_name) throws IOException
 {
 din = new DataInputStream(new FileInputStream(file_name));
 buffer = new byte[BUFFER_SIZE];
 bufferPointer = bytesRead = 0;
 }
 
 public String readLine() throws IOException
 {
 byte[] buf = new byte[100000]; // line length
 int cnt = 0, c;
 while ((c = read()) != -1)
 {
 if (c == '\n')
 break;
 buf[cnt++] = (byte) c;
 }
 return new String(buf, 0, cnt);
 }
 
 public int nextInt() throws IOException
 {
 int ret = 0;
 byte c = read();
 while (c <= ' ')
 c = read();
 boolean neg = (c == '-');
 if (neg)
 c = read();
 do
 {
 ret = ret * 10 + c - '0';
 } while ((c = read()) >= '0' && c <= '9');
 
 if (neg)
 return -ret;
 return ret;
 }
 
 public long nextLong() throws IOException
 {
 long ret = 0;
 byte c = read();
 while (c <= ' ')
 c = read();
 boolean neg = (c == '-');
 if (neg)
 c = read();
 do {
 ret = ret * 10 + c - '0';
 }
 while ((c = read()) >= '0' && c <= '9');
 if (neg)
 return -ret;
 return ret;
 }
 
 public double nextDouble() throws IOException
 {
 double ret = 0, div = 1;
 byte c = read();
 while (c <= ' ')
 c = read();
 boolean neg = (c == '-');
 if (neg)
 c = read();
 
 do {
 ret = ret * 10 + c - '0';
 }
 while ((c = read()) >= '0' && c <= '9');
 
 if (c == '.')
 {
 while ((c = read()) >= '0' && c <= '9')
 {
 ret += (c - '0') / (div *= 10);
 }
 }
 
 if (neg)
 return -ret;
 return ret;
 }
 
 private void fillBuffer() throws IOException
 {
 bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
 if (bytesRead == -1)
 buffer[0] = -1;
 }
 
 private byte read() throws IOException
 {
 if (bufferPointer == bytesRead)
 fillBuffer();
 return buffer[bufferPointer++];
 }
 
 public void close() throws IOException
 {
 if (din == null)
 return;
 din.close();
 }
 }
 
 public static void main(String[] args) throws Exception{
 Reader rd = new Reader();
 Print pr = new Print();
 
 int t = rd.nextInt();
 String ip;
 
 
 int len;
 
 while(t-->0) {
 ip = rd.readLine();
 len = ip.length();
 char op[] = new char[len];
 
 for (int i = 0; i < len; i++) {
 op[i] = (char) ((( ip.charAt(i) + ip.charAt(len - i - 1) - 193) % 26)+97);
 }
 pr.println(String.valueOf(op));
 }
 pr.close();
 }
}
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