Java基础篇之什么是CharArrayWriter

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。

下面的例子阐述了CharArrayWriter； 我们继续使用前面显示的ByteArrayOutputStream 例子中演示的程序。它的输出与以前的例子输出相同：

// 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()); 
 } 
}

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