Java-Readable

 1 import java.nio.*;
 2 import java.util.*;
 3 import static net.mindview.util.Print.*;
 4  
 5 public class RandomWords implements Readable {
 6   private int readCount = 1;//read()执行次数
 7   private int loopCount = 1;
 8   public RandomWords() {  }    
 9   public int read(CharBuffer cb) {
10  
11       if (loopCount == 1){print("进入read执行第" + readCount + "次");readCount++;cb.append("aa bb cc ");loopCount++;return 1;}//仅仅在第一次和第六次给CharBuffer添加3个数据
12       if (loopCount == 2){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}//其他的时候返回1，但是并不往Buffer中存放数据，来骗被调用者hasNext()，来观察出现了什么现象
13       if (loopCount == 3){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
14       if (loopCount == 4){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
15       if (loopCount == 5){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
16       
17       if (loopCount == 6){print("进入read执行第" + readCount + "次");readCount++;cb.append("oo pp qq ");loopCount++;return 1;}
18       if (loopCount == 7){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
19       if (loopCount == 8){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
20       if (loopCount == 9){print("进入read执行第" + readCount + "次");readCount++;loopCount++;return 1;}
21       if (loopCount == 10){print("进入read执行第" + readCount + "次");readCount++;return -1;}
22       return 1;      
23   }
24  
25   public static void main(String[] args) {
26       int a = 1;//外层循环的次数
27  
28       print("1");
29       Scanner s = new Scanner(new RandomWords())
30       print("2");
31       
32       
33       while(s.hasNext()){//这个hasNext()方法会调用read()方法的
34           print("第" + a + "次执行外层循环");
35           a ++;
36           System.out.println("从cb中读出 " + s.next());
37       }
38   }
39 }