Mybatis中openSSion和selectList无法使用

openSSion和selectList无法使用，报错提示Non-static method 'openSession()' cannot be referenced from a static context，请问应该如何解决

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;

public class mybitsDemo {
    public static void main(String[] args) throws Exception {

        //1.加载mybits的核心配置文件，获取SqlSessionFactory
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        //2.获取SqlSession对象，用它来执行sql
        SqlSession sqlSession=SqlSessionFactory.openSession();

        //3.执行sql
        List list=SqlSession.selectList("test.selectAll");

        System.out.println(list);

        //4.释放资源
        sqlSession.close();
    }
}