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Java 程序示例：实现了一个简单的社交媒体平台：
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
class User {
private String username;
private String password;
private List<Post> posts;
public User(String username, String password) {
this.username = username;
this.password = password;
posts = new ArrayList<>();
}
public String getUsername() {
return username;
}
public void addPost(Post post) {
posts.add(post);
}
public List<Post> getPosts() {
return posts;
}
}
class Post {
private String content;
private String author;
private List<String> comments;
public Post(String content, String author) {
this.content = content;
this.author = author;
comments = new ArrayList<>();
}
public String getContent() {
return content;
}
public String getAuthor() {
return author;
}
public void addComment(String comment) {
comments.add(comment);
}
public List<String> getComments() {
return comments;
}
}
class SocialMediaPlatform {
private Map<String, User> users;
public SocialMediaPlatform() {
users = new HashMap<>();
}
public void addUser(User user) {
users.put(user.getUsername(), user);
}
public User getUser(String username) {
return users.get(username);
}
}
public class Main {
public static void main(String[] args) {
SocialMediaPlatform platform = new SocialMediaPlatform();
User user1 = new User("alice", "password123");
User user2 = new User("bob", "password456");
platform.addUser(user1);
platform.addUser(user2);
Post post1 = new Post("Hello, world!", "alice");
Post post2 = new Post("I love programming.", "bob");
user1.addPost(post1);
user2.addPost(post2);
post1.addComment("Nice post!");
post2.addComment("Keep up the good work!");
System.out.println("User: " + user1.getUsername());
System.out.println("Posts:");
for (Post post : user1.getPosts()) {
System.out.println("Content: " + post.getContent());
System.out.println("Author: " + post.getAuthor());
System.out.println("Comments:");
for (String comment : post.getComments()) {
System.out.println("- " + comment);
}
System.out.println("-----------------------");
}
}
}
这个程序示例实现了一个社交媒体平台，包括用户类 User，帖子类 Post 和社交媒体平台类 SocialMediaPlatform。用户类具有用户名、密码和帖子列表等属性，并提供添加帖子和获取帖子列表的方法。帖子类具有内容、作者和评论列表等属性，并提供添加评论和获取评论列表的方法。社交媒体平台类具有用户列表，并提供添加用户和获取用户的方法。
在 main 函数中，示例创建了一个社交媒体平台对象 platform，并在平台上添加了两个用户 user1 和 user2，然后每个用户都发布了一个帖子，并给帖子添加了评论。最后，打印了用户1的帖子及其评论。
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