Sorting scorify challenge of the month challenge

Sorting.java

package com.algorithms;

/**
 * @Author Mehdi Maick
 * Created on 25/09/2016.
 */

import java.util.*;
import java.io.*;

public class Sorting {
    public static void solve(FastReader fs, PrintWriter pw) {
        String line;
        String[] data;
        boolean[] pos;
        int t = fs.nextInt();
        while (t-- > 0){
            data = fs.nextLine().split(" ");
            int n = data.length;
            ArrayList<Integer> ints = new ArrayList<>();
            ArrayList<String> s = new ArrayList<>();
            pos = new boolean[n];
            for (int i = 0; i < n; i++) {
                try{
                    int tmp = Integer.parseInt(data[i]);
                    ints.add(tmp);
                    pos[i] = true;
                }catch(Exception e){
                    s.add(data[i]);
                }
            }
            ints.sort(null);
            s.sort(new Comparator<String>() {
                @Override
                public int compare(String o1, String o2) {
                    String a = o1.toLowerCase();
                    String b = o2.toLowerCase();
                    return a.compareTo(b);
                }
            });
            StringBuilder sb = new StringBuilder();
            int j =0, k = 0;
            for (int i = 0; i < n; i++) {
                if(pos[i]){
                    sb.append(ints.get(j++)+ " ");
                }else{
                    sb.append(s.get(k++) + " ");
                }
            }
            pw.println(sb.toString().trim());
        }
    }

    public static void main(String[] args) throws Exception {
        FastReader fs = new FastReader(System.in);
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));

        solve(fs, pw);

        fs.close();
        pw.close();
    }

    static class FastReader {

        BufferedReader reader;
        StringTokenizer st;

        FastReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream));
            st = null;
        }

        String next() {
            while (st == null || !st.hasMoreTokens()) {
                try {
                    String line = reader.readLine();
                    if (line == null) {
                        return null;
                    }
                    st = new StringTokenizer(line);
                } catch (Exception e) {
                    throw new RuntimeException();
                }
            }
            return st.nextToken();
        }

        String nextLine() {
            String s = null;
            try {
                s = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return s;
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        char nextChar() {
            return next().charAt(0);
        }

        int[] nextIntArray(int n) {
            int[] arr = new int[n];
            int i = 0;
            while (i < n) {
                arr[i++] = nextInt();
            }
            return arr;
        }

        long[] nextLongArray(int n) {
            long[] arr = new long[n];
            int i = 0;
            while (i < n) {
                arr[i++] = nextLong();
            }
            return arr;
        }

        int[] nextIntArrayOneBased(int n) {
            int[] arr = new int[n + 1];
            int i = 1;
            while (i <= n) {
                arr[i++] = nextInt();
            }
            return arr;
        }

        long[] nextLongArrayOneBased(int n) {
            long[] arr = new long[n + 1];
            int i = 1;
            while (i <= n) {
                arr[i++] = nextLong();
            }
            return arr;
        }

        void close() {
            try {
                reader.close();
            } catch (IOException e) {
                System.err.println("There's been an error trying closing the reader ");
                e.printStackTrace();
            }
        }
    }


}