CharBuffer

CharBuffer是java.nio包下的一个类，作用是可以操作字符缓冲区。

暂时只需要用到append(char)这个方法:

书中用到的地方：

//: interfaces/RandomWords.java
// Implementing an interface to conform to a method.
import java.nio.*;
import java.util.*;

public class RandomWords implements Readable {
  private static Random rand = new Random(47);
  private static final char[] capitals =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();
  private static final char[] lowers =
    "abcdefghijklmnopqrstuvwxyz".toCharArray();
  private static final char[] vowels =
    "aeiou".toCharArray();
  private int count;
  public RandomWords(int count) { this.count = count; }	
  public int read(CharBuffer cb) {
    if(count-- == 0)
      return -1; // Indicates end of input
    cb.append(capitals[rand.nextInt(capitals.length)]);
    for(int i = 0; i < 4; i++) {
      cb.append(vowels[rand.nextInt(vowels.length)]);
      cb.append(lowers[rand.nextInt(lowers.length)]);
    }
    cb.append(" ");
    return 10; // Number of characters appended
  }
  public static void main(String[] args) {
    Scanner s = new Scanner(new RandomWords(10));
    while(s.hasNext())
      System.out.println(s.next());
  }
} /* Output:
Yazeruyac
Fowenucor
Goeazimom
Raeuuacio
Nuoadesiw
Hageaikux
Ruqicibui
Numasetih
Kuuuuozog
Waqizeyoy
*///:~

我的理解是，一个缓冲区就相当于一次性输出的内容。