Sample Java Library

Message.java

package org.avgp.sample;

import org.avgp.sample.User;
import org.json.JSONString;

public class Message implements JSONString {
    protected User sender;
    protected User receipient;
    protected String content;
    
    public Message(User from, User to, String content) {
        this.sender = from;
        this.receipient = to;
        this.content = content;
    }
    
    public String toJSONString() {
        return "{sender: " + this.sender.toJSONString() + ", receipient: " + this.receipient.toJSONString() + ", content: \"" + this.content + "\"}";
    }
    
}

User.java

package org.avgp.sample;

import java.util.UUID;
import org.json.JSONString;

public class User implements JSONString {
    private String name;
    private UUID id;
    
    public User(String name) {
        this.name = name;
        this.id = UUID.randomUUID();
    }
    
    public String getName() {
        return this.name;
    }
    
    public UUID getId() {
        return this.id;
    }
    
    public String toJSONString() {
        return "{name: \"" + this.name + "\", id: \"" + this.id.toString() + "\"}";
    }
    
}