BufferedReader dan BufferedWriter

Kelas Java BufferedReader membaca teks dari aliran input karakter, melakukan buffering pada karakter yang dibaca untuk memungkinkan pembacaan karakter, array, dan string yang efisien. Anda dapat menentukan ukuran buffer sebagai parameter kedua di konstruktor. Desainer:

BufferedReader(Reader in) // Creates a character input buffer stream that uses the default buffer size.
BufferedReader(Reader in, int sz) // Creates a character input buffer stream that uses the specified size.

Metode:

close() // close the stream
mark(int readAheadLimit) // mark the position in the stream
markSupported() // does it support thread tagging
int read() // read buffer
int read(char[] cbuf, int off, int len) // read buffer
String readLine() // next line
boolean ready() // can the thread read
reset() // reset stream
skip(long n) // skip characters

Contoh penggunaan kelas BufferedReader dan BufferedWriter: Membaca file:

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FileReaderExample {

	public static void main(String[] args) {
		String inputFileName = "file.txt";

		try (BufferedReader reader = new BufferedReader(new FileReader(inputFileName))) {
			String line;
			while ((line = reader.readLine()) != null) {
				System.out.println(line + "\n");
			}
		}
                catch (IOException e) {
			e.printStackTrace();
		}
	}

}

Kelas Java BufferedWriter menulis teks ke aliran keluaran karakter, melakukan buffering pada karakter tertulis untuk memungkinkan penulisan karakter, array, dan string yang efisien. Anda dapat menentukan ukuran buffer sebagai parameter kedua di konstruktor. Desainer:

BufferedWriter(Writer out) // Creates a character output buffer stream that uses the default buffer size.
BufferedWriter(Writer out, int sz) // Creates a character output buffer stream that uses the specified size.

Metode:

close() // close the stream
flush() // pass data from buffer to Writer
newLine() // wrap to new line
write(char[] cbuf, int off, int len) // write to buffer
write(int c) // write to buffer
write(String s, int off, int len) // write to buffer

Contoh penggunaan kelas Java BufferedReader dan BufferedWriter: Menulis ke file

import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;

public class FileWritterExample {

	public static void main(String[] args) {
		String outputFileName = "file.txt";
		String[] array = { "one", "two", "three", "four" };

		try (BufferedWriter writter = new BufferedWriter(new FileWriter(outputFileName))) {
			for (String value : array) {
				writter.write(value + "\n");
			}
		}
        catch (IOException e) {
			e.printStackTrace();
		}
	}

}

FileWritersegera menulis data ke disk dan mengaksesnya setiap saat, buffer berfungsi sebagai pembungkus dan mempercepat aplikasi. Buffer akan menulis data ke dirinya sendiri, dan kemudian sebagian besar file ke disk. Kami membaca data dari konsol dan menulisnya ke file:

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

public class ConsoleReaderExample {

	public static void main(String[] args) {
		String outputFileName = "file.txt";

		try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in))) {
			try (BufferedWriter writter = new BufferedWriter(new FileWriter(outputFileName))) {
				String line;
				while (!(line = reader.readLine()).equals("exit")) { // Break the loop when writing the line exit
					writter.write(line);
				}
			}
		}
         catch (IOException e) {
			e.printStackTrace();
		}
	}

}