java对象练习

对象练习

1. 通过输入学号,打印学生信息

   package wu.Demo01;
   
   import java.util.Scanner;
   
   public class Server {
       public static void main(String[] args) {
           Student s1 = new Student();
           Student s2 = new Student();
           Student s3 = new Student();
           Student s4 = new Student();
           s1.student(180110,"张三",85,90);
           s2.student(180111,"李四",80,91);
           s3.student(180112,"王五",82,92);
           s4.student(180113,"刘立群",75,95);
           System.out.println("请输入学号：");
           Scanner scanner = new Scanner(System.in);
           int sum = scanner.nextInt();
   
               if (sum == 180110) {
   
   
                   System.out.print("学号：" + s1.id + "\n姓名：" + s1.name + "\n英语：" +
                           s1.english + "\n数学：" + s1.math);
               }else if(sum == 180111) {
   
                   System.out.print("学号：" + s2.id + "\n姓名：" + s2.name + "\n英语：" +
                           s2.english + "\n数学：" + s2.math);
   
               }else if(sum == 180112) {
                   System.out.print("学号：" + s3.id + "\n姓名：" + s3.name + "\n英语：" +
                           s3.english + "\n数学：" + s3.math);
               }else {
                   System.out.print("学号：" + s4.id + "\n姓名：" + s4.name + "\n英语：" +
                           s4.english + "\n数学：" + s4.math);
               }
           }
       }
   
   
   class Student{
       int id;
       String name;
       int english;
       int math;
       public void student(){
   
       }
       public void student(int id, String name, int english,int math){
           this.id = id;
           this.name = name;
           this.english = english;
           this.math = math;
       }
   }
   

2. 师生咨询

package Talk.wu;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;

public class TalkSend implements Runnable {
    DatagramSocket socket = null;
    BufferedReader reader = null;

    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSend(int fromPort, String toIP, int toPort) {
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;

        try {
            socket = new DatagramSocket(fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {


        while (true) {


            try {
                String data = reader.readLine();
                final byte[] datas = data.getBytes();
                DatagramPacket packet = new DatagramPacket(datas, 0, datas.length,
                        new InetSocketAddress(this.toIP,this.toPort));

                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        socket.close();
    }
}

package Talk.wu;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class TalkReceive implements Runnable {
    DatagramSocket socket = null;

    private int port;
    private String msgFrom;

    public TalkReceive(int port,String msgFrom) {
        this.port = port;
        this.msgFrom = msgFrom;

        try {
            socket = new DatagramSocket(port);
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {

        while (true) {

            try {
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container, 0, container.length);
                socket.receive(packet);

                byte[] data = packet.getData();
                String reveiveData = new String(data, 0, data.length);
                System.out.println(msgFrom + ":" + reveiveData);

                if (reveiveData.equals("bye")){
                    break;
                }

                socket.receive(packet);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        socket.close();
    }
}

package Talk.wu;

public class Student {
    public static void main(String[] args) {
        new Thread(new TalkSend(6666,"localhost",8888)).start();
        new Thread(new TalkReceive(7777,"老师")).start();
    }
}

package Talk.wu;

public class Teacher {
    public static void main(String[] args) {
        new Thread(new TalkSend(5555,"localhost",7777)).start();
        new Thread(new TalkReceive(8888,"学生")).start();
    }
}