Started code of Input/Output on Java

Solution.java

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

public class Solution {

    public static void main(String[] args) {
        InputStream inputStream  = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(in, out);
        out.close();
    }

    static class Task {
        public void solve(InputReader in, PrintWriter out) {
            // in.next() - read string separated by whitespaces or line feed
            // in.nextLine() - read string separated by line feed (\n)
            // in.nextInt() - read integer separated by whitespaces or line feed
            // in.nextLong() - read long separated by whitespaces or line feed 
            // in.nextDouble() - read double separated by whitespaces or line feed
            // in.nextBigInt() - read big integer separated by whitespaces or line feed 
            // in.nextBigDec() - read big decimal separated by whitespaces or line feed
            
            // construction for read unknown count of input lines
            String input;
            do {
                input = in.nextLine();
            } while(in.hasNext());
        }
    }

    static class InputReader {
        private BufferedReader reader;
        private StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }
        
        public long nextLong() {
            return Long.parseLong(next());
        }
        
        public double nextDouble() {
            return Double.parseDouble(next());
        }
        
        public BigInteger nextBigInt() {
            return new BigInteger(next());
        }

        public BigDecimal nextBigDec() {
            return new BigDecimal(next());
        }

        public String nextLine() {
            String str = "";
            try {
                str = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }

        public boolean hasNext() {
            try {
                return reader.ready();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return false;
        }
    }
}