BufferedReader class « BufferedReader « Reader for Input « File Stream

Constructor	Summary
BufferedReader(Reader in)	Creates a buffering character-input stream that uses a default-sized input buffer.
BufferedReader(Reader in, int sz)	Creates a buffering character-input stream that uses an input buffer of the specified size.

Return	Method	Summary
void	close()	Closes the stream and releases any system resources associated with it.
void	mark(int readAheadLimit)	Marks the present position in the stream.
boolean	markSupported()	Tells whether this stream supports the mark() operation, which it does.
int	read()	Reads a single character.
int	read(char[] cbuf, int off, int len)	Reads characters into a portion of an array.
String	readLine()	Reads a line of text.
boolean	ready()	Tells whether this stream is ready to be read.
void	reset()	Resets the stream to the most recent mark.
long	skip(long n)	Skips characters.


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

public class Main {
  public static void main(String[] args) throws Exception {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    String strLine = in.readLine();
    BufferedWriter out = new BufferedWriter(new OutputStreamWriter(System.out));
    out.write(strLine, 0, strLine.length());
    out.flush();
    in.close();
    out.close();
  }
}


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

public class Standard {

  public static void main(String args[]) throws IOException {
    BufferedReader cin = new BufferedReader(new InputStreamReader(System.in));
    String number;
    int total = 0;

    while ((number = cin.readLine()) != null) {
      try {
        total += Integer.parseInt(number);
      } catch (NumberFormatException e) {
        System.err.println("Invalid number in input");
        System.exit(1);
      }
    }
    System.out.println(total);
  }
}


import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;

public class Main {
  public static void main(String[] argv) {
    try {
      BufferedReader br = new BufferedReader(new FileReader(new File("c:\\a.txt")));
      StringBuilder sb = new StringBuilder();
      String line = br.readLine();
      while (line != null) {
        sb.append(line + "\n");
        line = br.readLine();
      }
      br.close();
      System.out.println(sb.toString());
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}