FileWriter类 示例

/*

FileWriter 创建一个可以写文件的Writer 类。它最常用的构造函数如下：

FileWriter(String filePath)

FileWriter(String filePath, boolean append)

FileWriter(File fileObj)

它们可以引发IOException或SecurityException异常。这里，filePath是文件的完全路径，fileObj是描述该文件的File对象。如果append为true，输出是附加到文件尾的。FileWriter类的创建不依赖于文件存在与否。在创建文件之前，FileWriter将在创建对象时打开它来作为输出。如果你试图打开一个只读文件，将引发一个IOException异常。

*/

// Demonstrate FileWriter.
import java.io.*;
class FileWriterDemo{
 public static void main(String[] args) throws Exception {
  String source = "Now is the time for all good men\n"
        + " to come to the aid of their country\n"
        + " and pay their due taxes.";
  char buffer[] = new char[source.length()];
  source.getChars(0, source.length(), buffer, 0);
  FileWriter f0 = new FileWriter("file1.txt");
  for (int i=0; i < buffer.length; i += 2) {
   f0.write(buffer[i]);
  }
  f0.close();
  FileWriter f1 = new FileWriter("file2.txt");
  f1.write(buffer);
  f1.close();
  FileWriter f2 = new FileWriter("file3.txt");
  f2.write(buffer,buffer.length-buffer.length/4,buffer.length/4);
  f2.close();
 }
}