为啥代码会被划掉

package entity;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.cfg.Configuration;

import org.hibernate.service.ServiceRegistry;

import org.hibernate.tool.hbm2ddl.SchemaExport;

import org.junit.Test;

public class TestStudents {

@Test

public void testSchemaExport(){

Configuration config=new Configuration().configure();

ServiceRegistry serviceRegistry= new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();

SessionFactory sessionFactory=config.buildSessionFactory(serviceRegistry);

Session session =sessionFactory.getCurrentSession();

SchemaExport export=new SchemaExport(config);

}

}