private RecyclerView recyclerView; DeviceAdapter adapter; // socket DatagramSocket sendSocket = null; InetAddress serverAddress = null; public XbyActivity() { super(); }
时间: 2024-04-28 19:26:47 浏览: 8
这段代码看起来像是一个 Android Activity 类的构造函数,其中包含了一个 RecyclerView 和一个自定义的 DeviceAdapter 对象。同时还声明了一个 DatagramSocket 对象 sendSocket 和一个 InetAddress 对象 serverAddress 用于进行 socket 通信。这个 Activity 类的具体功能需要看更多的代码才能确定。
相关问题
private RecyclerView recyclerView; DeviceAdapter adapter; // socket DatagramSocket sendSocket = null; InetAddress serverAddress = null; public XbyActivity() { super(); }解释每一句
1. `private RecyclerView recyclerView;`: 声明了一个私有的 RecyclerView 对象,用于显示列表数据。
2. `DeviceAdapter adapter;`: 声明了一个 DeviceAdapter 对象,用于为 RecyclerView 提供数据适配器。
3. `DatagramSocket sendSocket = null;`: 声明了一个 DatagramSocket 对象 sendSocket,并将其初始化为 null。DatagramSocket 是 Java 中用于进行 UDP 协议通信的类。
4. `InetAddress serverAddress = null;`: 声明了一个 InetAddress 对象 serverAddress,并将其初始化为 null。InetAddress 是 Java 中用于表示 IP 地址的类。
5. `public XbyActivity() { super(); }`: 这是 XbyActivity 类的构造函数,调用了父类的构造函数。如果没有其他代码,这个构造函数就是一个空函数,没有实际作用。
import java.io. *; import java.net.*; import java.util. *; public class EchoServer{ public static void main(String[] args) throws IOException {new EchoServerThread().start();}} class EchoServerThread extends Thread{ protected DatagramSocket socket = null; protected BufferedReader in = null; protected boolean hasMoreWork = true; protected int number = 0;//访问计数变量 public EchoServerThread() throws IOException{ this("EchoServerThread"); } public EchoServerThread(String name) throws IOException{ super(name); socket = new DatagramSocket(4248); public void run(){ while (hasMoreWork) { try{ byte[] buf = new byte[256];//接收应答 DatagramPacket packet = new DatagramPacket(buf, buf.length); socket.receive(packet); //创建应答 String dString = null; number++; dString ="Hi!你是第"+ number + "个访问者!"; buf = dString.getBytes();//将应答发送给端口和地址为"address""port"的客户 InetAddress address = packet.getAddress(); int port = packet.getPort(); packet = new DatagramPacket(buf, buf.length, address, port); socket.send(packet); }catch (IOException e){ e.printStackTrace(); hasMoreWork = false; } } socket.close();} } }哪里出错了
代码中有几个语法错误:
1. 在 EchoServerThread 构造函数中没有关闭构造函数的大括号。
2. run() 函数中没有关闭while循环的大括号。
3. 在 run() 函数中,未在 EchoServerThread 类之前添加 public 关键字。
下面是修改后的代码:
```java
import java.io.*;
import java.net.*;
import java.util.*;
public class EchoServer {
public static void main(String[] args) throws IOException {
new EchoServerThread().start();
}
}
class EchoServerThread extends Thread {
protected DatagramSocket socket = null;
protected BufferedReader in = null;
protected boolean hasMoreWork = true;
protected int number = 0; // 访问计数变量
public EchoServerThread() throws IOException {
this("EchoServerThread");
}
public EchoServerThread(String name) throws IOException {
super(name);
socket = new DatagramSocket(4248);
}
public void run() {
while (hasMoreWork) {
try {
byte[] buf = new byte[256]; // 接收应答
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet); // 创建应答
String dString = null;
number++;
dString = "Hi!你是第" + number + "个访问者!";
buf = dString.getBytes(); // 将应答发送给端口和地址为"address" "port"的客户
InetAddress address = packet.getAddress();
int port = packet.getPort();
packet = new DatagramPacket(buf, buf.length, address, port);
socket.send(packet);
} catch (IOException e) {
e.printStackTrace();
hasMoreWork = false;
}
}
socket.close();
}
}
```