添加注释

src/main/java/com/example/springdemo/SpringDemoApplication.java

@@ -6,6 +6,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 @SpringBootApplication
 public class SpringDemoApplication {
     public static void main(String[] args) {
+        //启动主目录下的SpringDemoApplication.java
         SpringApplication.run(SpringDemoApplication.class, args);
     }
 }