code: private void supportCloneable(TopLevelClass topLevelClass, IntrospectedTable introspectedTable) {
          // implement
          topLevelClass.addSuperInterface(new FullyQualifiedJavaType("java.lang.Cloneable"));
          // clone
          Method cloneMethod = JavaElementGeneratorTools.generateMethod(
                  "clone",
                  JavaVisibility.PUBLIC,
                  topLevelClass.getType()
          );
          commentGenerator.addGeneralMethodComment(cloneMethod, introspectedTable);
          cloneMethod.addAnnotation("@Override");
          cloneMethod.addException(new FullyQualifiedJavaType("java.lang.CloneNotSupportedException"));
          cloneMethod.addBodyLine("return (" + topLevelClass.getType().getShortName() + ") super.clone();");
          topLevelClass.addMethod(cloneMethod);
      }
docs: 支持Cloneable
  @param topLevelClass
  @param introspectedTable