Java写了个简单的网络编程程序，运行没有结果，求解谢谢！

Question

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class Kehuduan {
public static void main(String[] args) {
Socket s;
try {
s = new Socket("127.0.0.1", 8888);
OutputStream out = s.getOutputStream();
PrintStream pw = new PrintStream(out);
pw.println("嘿嘿收到了吗？");
pw.println("收到了回复！");

        InputStream in = s.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        StringBuffer sb = new StringBuffer();
        char[] c = new char[2];
        int len = -1;
        while((len = br.read(c)) != -1){
            sb.append(c, 0, len);
        }
        System.out.println(sb);

        br.close();
        in.close();
        pw.close();
        out.close();
    } catch (UnknownHostException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

}

}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;

public class Fuwuqi {
public static void main(String[] args) {
try {
ServerSocket ss = new ServerSocket(8888);
System.out.println("服务器已经启动，正在等待连接。。。");
Socket s = ss.accept();

        InputStream in = s.getInputStream();
        BufferedReader br = new BufferedReader(new InputStreamReader(in));
        StringBuffer sb = new StringBuffer();
        char[] c = new char[2];
        int len = -1;
        while((len = br.read(c)) != -1){
            sb.append(c, 0, len);
        }
        System.out.println(sb);

        OutputStream out = s.getOutputStream();
        PrintWriter print = new PrintWriter(out);
        print.println("嘿嘿");
        print.println("嘻嘻");

        print.close();
        out.close();
        br.close();
        in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

}

Answer 1

把int len ＝-1换成0