import socket # 客户端的IP地址和端口号 client_ip = '192.168.1.1'client_port = 12345 # 服务器的IP地址和端口号 server_ip = '202.112.20.132'server_port = 54321 # 创建UDP套接字 client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # 绑定客户端的IP地址和端口号 client_socket.bind((client_ip, client_port)) # 发送数据 data = 'Hello, this is client.'client_socket.sendto(data.encode(), (server_ip, server_port)) # 接收数据 recv_data, addr = client_socket.recvfrom(1024)print('Received data: ', recv_data.decode()) # 关闭套接字 client_socket.close()将以上程序变为Java的socket程序

以下是将Python程序转化为Java程序的过程：

import java.io.*;
import java.net.*;

public class Client {
    public static void main(String[] args) throws Exception {
        String client_ip = "192.168.1.1";
        int client_port = 12345;
        String server_ip = "202.112.20.132";
        int server_port = 54321;

        // 创建UDP套接字
        DatagramSocket client_socket = new DatagramSocket(client_port, InetAddress.getByName(client_ip));

        // 发送数据
        String data = "Hello, this is client.";
        byte[] send_data = data.getBytes();
        DatagramPacket send_packet = new DatagramPacket(send_data, send_data.length, InetAddress.getByName(server_ip), server_port);
        client_socket.send(send_packet);

        // 接收数据
        byte[] recv_buffer = new byte[1024];
        DatagramPacket recv_packet = new DatagramPacket(recv_buffer, recv_buffer.length);
        client_socket.receive(recv_packet);
        String recv_data = new String(recv_packet.getData(), 0, recv_packet.getLength());
        System.out.println("Received data: " + recv_data);

        // 关闭套接字
        client_socket.close();
    }
}

转化后的Java程序与原来的Python程序实现的功能相同，都是通过UDP协议向服务器发送"Hello, this is client."字符串，并从服务器接收数据。