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public class ComplexSalesforceClass implements Comparable, Database.Batchable<sObject>, Queueable, Database.AllowsCallouts {
    
    // Interface implementations
    
    // Comparable interface
    public Integer compareTo(Object o) {
        ComplexSalesforceClass other = (ComplexSalesforceClass)o;
        // Compare logic based on some criteria
        if (/*some condition*/) {
            return 1;
        } else if (/*another condition*/) {
            return -1;
        } else {
            return 0;
        }
    }
    
    // Batchable interface
    public Database.QueryLocator start(Database.BatchableContext context) {
        return Database.getQueryLocator('SELECT Id, Name FROM Account WHERE CreatedDate >= :System.today().addDays(-30)');
    }
    
    public void execute(Database.BatchableContext context, List<Account> scope) {
        List<Contact> contactsToUpdate = new List<Contact>();
        for (Account acc : scope) {
            // Example logic: Update related contacts
            List<Contact> contacts = [SELECT Id, LastName FROM Contact WHERE AccountId = :acc.Id];
            for (Contact con : contacts) {
                con.LastName = 'UpdatedLastName';
                contactsToUpdate.add(con);
            }
        }
        update contactsToUpdate;
    }
    
    public void finish(Database.BatchableContext context) {
        // Batch finish logic, if any
    }
    
    // Queueable interface
    public void execute(QueueableContext context) {
        // Example logic: Create a Task
        Task newTask = new Task(
            Subject = 'Queueable Task Created',
            Status = 'Completed'
        );
        insert newTask;
    }
    
    // AllowsCallouts interface
    public void execute(CallableContext context) {
        // Example callout logic
        Http http = new Http();
        HttpRequest req = new HttpRequest();
        req.setEndpoint('https://api.example.com');
        req.setMethod('GET');
        HttpResponse res = http.send(req);
        // Process response as needed
    }
    
    // Custom methods
    
    // Example method
    public void performCustomOperation() {
        // Custom operation logic here
    }
    
    // Constructor
    public ComplexSalesforceClass() {
        // Constructor logic here
    }
}