Class 为什么我不能保存这个SalesForce批处理类？

我目前正在使用更新我对SalesForce的了解

教程15第1课：提供以下代码：

global class CleanUpRecords implements Database.Batchable<Object>
{
    global final String query;

    global CleanUpRecords (String q) {query = q;}

    global Database.Querylocator start (Database.BatchableContext BC)
    {
           return Database.getQueryLocator(query);
    }    


    global void execute (Database.BatchableContext BC, List<sObject> scope)
    {
        delete scope;
        Database.emptyRecycleBin(scope);
    }    

    global void finish(Database.BatchableContext BC)
    {
        AsyncApexJob a = [
                SELECT Id, Status, NumberOfErrors, JobItemsProcessed, TotalJobItems, CreatedBy.Email
                FROM AsyncApexJob 
                WHERE Id = :BC.getJobId()
            ];

        // Send an email to the Apex job's submitter
        // notifying of job completion.
        Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
        String[] toAddresses = new String[] {a.CreatedBy.Email};
        mail.setToAddresses(toAddresses);
        mail.setSubject('Record Clean Up Completed ' + a.Status);
        mail.setPlainTextBody (
                'The batch Apex job processed ' + a.TotalJobItems +
                ' batches with '+ a.NumberOfErrors + ' failures.'
               );
        Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    }

}

但是，无论我使用哪种开发界面，例如Force IDE、控制台、设置，当我尝试保存时，我都会得到：

Multiple markers at this line
    - File only saved locally, not to server
    - Save error: CleanUpRecords: Class must implement the global interface method: Iterable<Object> start(Database.BatchableContext) from Database.Batchable<Object>, CleanUpRecords: Class must implement the global interface method: void execute(Database.BatchableContext, LIST<Object>) from 
     Database.Batchable<Object>

或者其他类似的，取决于我如何保存它

然而，在我看来，所需的方法已经存在

---

缺少什么？

准备好沮丧吧。。。只差一个字符

你的班级声明应该是：

global class CleanUpRecords implements Database.Batchable<sObject> {

而不是：

global class CleanUpRecords implements Database.Batchable<Object> {

---

我尝试了这个数据库。但是，它给了我同样的错误。我认为泛型意味着你可以使用任何对象。但后来，我意识到这是Apex代码。谢谢你的提问-