JAVA 빠른 입출력의 모든것

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

class OutputWriter {
    private BufferedWriter writer;

    public OutputWriter() {
        writer = new BufferedWriter(new OutputStreamWriter(System.out));
    }

    public OutputWriter(String fileName) throws IOException {
        writer = new BufferedWriter(new FileWriter(fileName));
    }

    public void print(String s) throws IOException {
        writer.write(s);
    }

    public void println(String s) throws IOException {
        writer.write(s);
        writer.newLine();
    }

    public void print(int i) throws IOException {
        writer.write(Integer.toString(i));
    }

    public void println(int i) throws IOException {
        writer.write(Integer.toString(i));
        writer.newLine();
    }

    // You can add more print methods for different data types as needed.

    public void close() throws IOException {
        writer.flush();
        writer.close();
    }
}

class InputReader {
    public BufferedReader reader;
    public StringTokenizer st;

    public InputReader() {
        reader = new BufferedReader(new InputStreamReader(System.in));
    }

    public String next() {
        while (st == null || !st.hasMoreTokens()) {
            st = new StringTokenizer(nextLine());
        }
        return st.nextToken();
    }

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

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