CharArrayWriter类 示例
/*
CharArrayWriter 实现了以数组作为目标的输出流。CharArrayWriter 有两个构造函数：CharArrayWriter( )CharArrayWriter(int numChars)第一种形式，创建了一个默认长度的缓冲器。第二种形式，缓冲器长度由numChars指定。缓冲器保存在CharArrayWriter的buf 成员中。缓冲器大小在需要的情况下可以自动增长。缓冲器保持的字符数包含在CharArrayWriter的count 成员中。buf 和count 都是受保护的域。*/
//Demonstrate CharArrayWriter.
import java.io.*;
class CharArrayWriterDemo{
?public static void main(String[] args) throws IOException{
??CharArrayWriter f = new CharArrayWriter();
??String s = "This should end up in the array";
??char buf[] = new char[s.length()];
??s.getChars(0, s.length(), buf, 0);
??f.write(buf);
??System.out.println("Buffer as a string");
??System.out.println(f.toString());
??System.out.println("Into array");
??char c[] = f.toCharArray();
??for(int i=0;i<c.length;i++){
???System.out.print((char)c[i]);
??}
??System.out.println("\nTo a FileWriter()");
??FileWriter f2 = new FileWriter("test.txt");
??f.writeTo(f2);
??f2.close();
??System.out.println("Doing a reset");
??f.reset();
??for (int i=0; i<3; i++)
???f.write('X');
??System.out.println(f.toString());
?}
}
