分析以下代码 public class PersonInput implements PersonAction { @Override public Person process(Person person) { Scanner scanner = new Scanner(System.in); Class personClass = person.getClass(); Field[] fields = personClass.getDeclaredFields(); for (Field field : fields) { Annotation[] annotations = field.getDeclaredAnnotations(); for (Annotation annotation : annotations) { if (annotation instanceof Label) { Label label = (Label) annotation; System.out.println(label.value() + ":"); } } try { String value = scanner.nextLine(); field.setAccessible(true); if (field.getType().equals(String.class)) { field.set(person, value); } else if (field.getType().equals(Integer.class)) { field.set(person, Integer.parseInt(value)); } else if (field.getType().equals(Boolean.class)) { field.set(person, Boolean.parseBoolean(value)); } } catch (Exception e) { e.printStackTrace(); } } return person; } }
时间: 2023-06-18 07:08:53 浏览: 52
这段代码定义了一个名为 `PersonInput` 的类,实现了 `PersonAction` 接口。其中的 `process` 方法接受一个 `Person` 对象作为参数,用于从控制台读取输入,并将输入值设置到该对象的属性中,最后返回该对象。
具体实现过程如下:
1. 获取 `person` 对象的类对象 `personClass`,并通过反射获取该类的所有属性 `fields`。
2. 遍历每个属性,判断其是否被 `Label` 注解修饰,若是则在控制台输出注解的值。
3. 从控制台读取用户输入的值 `value`,并通过反射设置到该属性中。根据属性的类型不同,使用不同的方法设置属性值,例如如果属性类型为 `String`,则直接将 `value` 设置到该属性中;如果属性类型为 `Integer`,则将 `value` 转换为整数后再设置;如果属性类型为 `Boolean`,则将 `value` 转换为布尔值后再设置。
4. 如果在设置属性值的过程中出现异常,则将异常信息打印出来。
需要注意的是,该代码使用了反射机制来动态地设置属性值,虽然方便了开发,但同时也增加了代码的复杂性和运行时开销。此外,该代码中的异常处理也比较简单粗暴,需要根据具体的业务需求进行修改。
相关问题
优化下面代码package Zzz; import java.awt.TexturePaint; import java.io.File; import java.io.FilenameFilter; import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; import java.text.BreakIterator; import java.util.Scanner; import javax.imageio.metadata.IIOInvalidTreeException; import javax.imageio.plugins.jpeg.JPEGImageWriteParam; import javax.sound.sampled.Port; import org.omg.CORBA.INTERNAL; public class Test3{ public static void main(String[] args) throws IOException { // TODO Auto-generated method stub Scanner scanner=new Scanner(System.in); System.out.print("请输入对方的IP地址"); String ipAddress=scanner.nextLine(); InetAddress ip=InetAddress.getByName(ipAddress); System.out.print("请输入对方的端口号"); int toPort=scanner.nextInt(); System.out.print("请输入本地接受的端口号:"); int listenPort=scanner.nextInt(); new Thread(); new Thread(); } } class SendThread implements Runnable{ private int Port; private InetAddress ip; public SendThread(int Port,InetAddress ip) { this.ip=ip; this.Port=Port; // TODO Auto-generated constructor stub } @Override public void run() { // TODO Auto-generated method stub try { Scanner scanner=new Scanner(System.in); DatagramSocket socket=new DatagramSocket(); System.out.println("开始聊天"); DatagramPacket packet=new DatagramPacket(new byte[1024], 1024, ip, Port); while(true){ String zyk=scanner.nextLine(); packet.setData(zyk.getBytes()); socket.send(packet); if (zyk.equals("bye")) { break; } } System.out.println("退出聊天"); socket.close(); } catch (Exception e) { // TODO: handle exception } } } class RecieveThread implements Runnable{ private int Port; public RecieveThread(int Port){ this.Port=Port; } @Override public void run() { while(true){ try { DatagramSocket socket=n
首先,你的代码存在一些问题,例如创建线程时没有指定线程任务,变量名不规范等等。以下是我对你的代码进行的优化:
1. 对变量名进行规范化,使其更易读懂。
2. 需要创建两个线程,一个用于发送消息,一个用于接收消息。因此我们需要在主线程中创建这两个线程,并且需要为它们指定任务。
3. 在发送消息的线程中,我们需要不断地从控制台读取用户输入,然后将其发送出去。需要注意的是,我们需要在循环中不断更新 DatagramPacket 对象中的数据部分。
4. 在接收消息的线程中,我们需要不断地接收来自对方的消息,并在控制台上输出。同样需要注意的是,在循环中需要不断更新 DatagramPacket 对象中的数据部分。
下面是优化后的代码:
```
package Zzz;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;
public class Test3 {
public static void main(String[] args) throws Exception {
Scanner scanner = new Scanner(System.in);
System.out.print("请输入对方的IP地址:");
String ipAddress = scanner.nextLine();
InetAddress ip = InetAddress.getByName(ipAddress);
System.out.print("请输入对方的端口号:");
int toPort = scanner.nextInt();
System.out.print("请输入本地接受的端口号:");
int listenPort = scanner.nextInt();
DatagramSocket socket = new DatagramSocket(listenPort);
Thread sendThread = new Thread(new SendTask(socket, ip, toPort));
Thread receiveThread = new Thread(new ReceiveTask(socket));
sendThread.start();
receiveThread.start();
}
}
class SendTask implements Runnable {
private final DatagramSocket socket;
private final InetAddress ip;
private final int toPort;
public SendTask(DatagramSocket socket, InetAddress ip, int toPort) {
this.socket = socket;
this.ip = ip;
this.toPort = toPort;
}
@Override
public void run() {
try {
Scanner scanner = new Scanner(System.in);
System.out.println("开始聊天");
while (true) {
String message = scanner.nextLine();
DatagramPacket packet = new DatagramPacket(message.getBytes(), message.getBytes().length, ip, toPort);
socket.send(packet);
if (message.equals("bye")) {
break;
}
}
System.out.println("退出聊天");
} catch (Exception e) {
e.printStackTrace();
} finally {
socket.close();
}
}
}
class ReceiveTask implements Runnable {
private final DatagramSocket socket;
public ReceiveTask(DatagramSocket socket) {
this.socket = socket;
}
@Override
public void run() {
try {
while (true) {
byte[] buffer = new byte[1024];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
socket.receive(packet);
String message = new String(packet.getData(), 0, packet.getLength());
System.out.println("对方说: " + message);
if (message.equals("bye")) {
break;
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
socket.close();
}
}
}
```
希望这些改进能帮助你更好地理解和使用该代码!
定义一个学生类Student,成员变量包括:姓名,生日,学号,学校;重写方法toString,equals,hashCode;实现接口Comparable,按照学号大小进行比较;定义构造方法。 代码形式如下: public class Main{ public static void main(String[] args) { Scanner in=new Scanner(System.in); int num=in.nextInt(); Student[
public class Student implements Comparable<Student>{
private String name;
private Date birthday;
private String id;
private String school;
public Student(String name, Date birthday, String id, String school) {
this.name = name;
this.birthday = birthday;
this.id = id;
this.school = school;
}
@Override
public String toString() {
return "Student{" +
"name='" + name + '\'' +
", birthday=" + birthday +
", id='" + id + '\'' +
", school='" + school + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Student)) return false;
Student student = (Student) o;
return getId().equals(student.getId());
}
@Override
public int hashCode() {
return Objects.hash(getId());
}
@Override
public int compareTo(Student o) {
return this.getId().compareTo(o.getId());
}
public String getName() {
return name;
}
public Date getBirthday() {
return birthday;
}
public String getId() {
return id;
}
public String getSchool() {
return school;
}
}
//在Main类中使用
public class Main{
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int num = in.nextInt();
Student[] students = new Student[num];
for (int i = 0; i < num; i++) {
String name = in.next();
Date birthday = new Date(in.next());
String id = in.next();
String school = in.next();
students[i] = new Student(name, birthday, id, school);
}
Arrays.sort(students);
for (Student student : students) {
System.out.println(student.toString());
}
}
}
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