[Java] BufferedReader/BufferedWriter 입출력

* 입출력 속도 향상

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {

	public static void main(String[] args) {
		try {
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
			
			String str = br.readLine();
			int i = Integer.parseInt(br.readLine());
			
			String str2 = "hi";
			bw.write(str);
			bw.write(i);
			bw.write(str2);
			
			bw.flush();
			bw.close();
		} catch (IOException e) {
			// IOExeception
		}

	}

}