Java 基本的IO操作

在線學習資料

Reading Console Input

BufferedReader br = new BufferedReader(new 
                      InputStreamReader(System.in));

Reading Characters from Console:

int read( ) throws IOException

// Use a BufferedReader to read characters from the console.

import java.io.*;

public class BRRead {
   public static void main(String args[]) throws IOException
   {
      char c;
      // Create a BufferedReader using System.in
      BufferedReader br = new BufferedReader(new 
                         InputStreamReader(System.in));
      System.out.println("Enter characters, 'q' to quit.");
      // read characters
      do {
         c = (char) br.read();
         System.out.println(c);
      } while(c != 'q');
   }
}

Reading Strings from Console:

String readLine( ) throws IOException

Writing Console Output:

void write(int byteval)

Reading and Writing Files:

FileInputStream:

InputStream f = new FileInputStream("C:/java/hello");

File f = new File("C:/java/hello");
InputStream f = new FileInputStream(f);

FileOutputStream:

OutputStream f = new FileOutputStream("C:/java/hello") 

File f = new File("C:/java/hello");
OutputStream f = new FileOutputStream(f);