JAVA 实现Readable接口的适配和Scanner的取用

import java.io.IOException;
import java.nio.CharBuffer;
import java.util.Random;
import java.util.Scanner;
class RandomInt implements Readable
{
    static int count=10;
    Random random=new Random(46);
    @Override
    public int read(CharBuffer cb) throws IOException {
        Integer i=random.nextInt(20);
        cb.append(i.toString());    //向缓冲区中添加内容
        cb.append(" ");
        count--;
        if(count==0) return -1; //-1表示中止
        return i.toString().length()+" ".length(); //返回一次append的字符串长度
    }
}
public class Main{
    public static void main(String[]args)
    {
        Scanner s=new Scanner(new RandomInt());
        while(s.hasNext())
        {
            System.out.println(s.next());
        }
    }
}

输出：

13
7
15
15
2
18
5
3
2
14