遇到Illegal Start of an Expression怎么解决？java报错

遇到Illegal Start of an Expression怎么解决？java报错

在编写java的样例代码时出现这种问题。这种情况应该如何解决和避免那？

} // ADD IT HERE
       public void newShape(String shape) {
        switch (shape) {
            case "Line":
                Shape line = new Line(startX, startY, endX, endY);
            shapes.add(line);
            break;
                case "Oval":
            Shape oval = new Oval(startX, startY, endX, endY);
            shapes.add(oval);
            break;
            case "Rectangle":
            Shape rectangle = new Rectangle(startX, startY, endX, endY);
            shapes.add(rectangle);
            break;
            default:
            System.out.println("ERROR. Check logic.");
        }
        }
    } // REMOVE IT FROM HERE
    }

原因是什么，为什么会发生异常，以及下面到底发生了什么。如果有人能帮忙？提前谢谢