package chararraywriter;

/**
 CharArrayWriter  實現了以數組作為目標的輸出流。CharArrayWriter  有兩個構造函數：
 CharArrayWriter( )
 CharArrayWriter(int numChars)
 第一種形式，創建了一個默認長度的緩沖器。第二種形式，緩沖器長度由numChars指
 定。緩沖器保存在CharArrayWriter的buf  成員中。緩沖器大小在需要的情況下可以自動增
 長。緩沖器保持的字符數包含在CharArrayWriter的count  成員中。buf  和count  都是受保護
 的域。
 下面的例子闡述了CharArrayWriter，我們繼續使用前面顯示的ByteArrayOutputStream
 例子中演示的程序。它的輸出與以前的例子輸出相同：

 Buffer as a string
This should end up in the array
Into array
This should end up in the array
To a FileWriter()
Doing a reset
XXX
 */

// 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(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());
  }
}