![]() ![]() Messages are arrows that represent communication between objects. When an object is busy executing a process or waiting for a reply message, use a thin gray rectangle placed vertically on its lifeline. Use the UML object symbol to illustrate class roles, but don't list object attributes.Īctivation boxes represent the time an object needs to complete a task. Search through SmartDraw's knowledge base, view frequently asked questions, or contact our support team.Ĭlass roles describe the way an object will behave in context. Read articles about best practices, find tips on collaborating, learn to give better presentations and more. The SmartDraw API allows you to skip the drawing process and generate diagrams from data automatically.Īdd data to shapes, import data, export manifests, and create data rules to change dashboards that update.Ĭheck out useful features that will make your life easier. Learn how to generate visuals like org charts and class diagrams from data.īrowse built-in data visualizers and see how you can build your own custom visualization. Learn how to combine free-form brainstorming with diagram blueprints all while collaborating with your team. Learn about all the types of diagrams you can create with SmartDraw. Get inspired by browsing examples and templates available in SmartDraw. ![]() Familiarize yourself with the UI, choosing templates, managing documents, and more. The activation record of the executing method.Learn how to make any type of visual with SmartDraw. Thus, at any given time, we highlight in yellow While all other activated methods are waiting for their caller to return. (and that method has its stack frame on top of the call stack), At any point in time only one method is actively executing.We use more emphasized styles for call and return arrows: (later in the course, when introduce exception handling, In the example below, we wanted to highlight two things:įor every call there is a corresponding return We often deviate somewhat from the description above,Įither to focus on a specific issue, or to save time. Note that when using this notional machine in class, In fact, we can have recursion also when we call the same method on a different object ( o.m() calling p.m()). This is different from some method of an object calling a (potentially different) method of the same object. Note that an object calling a method on itself (e.g., o.m() calling o.n()) does not necessarily mean that there is a recursive method call! There only is recursion if a method calls itself (e.g., o.m() calling o.m()). In this case the call and the return arrow start from the object’s lifeline and end at the same object’s lifeline. The corresponding return is shown with a dashed arrow, from the called object back to the calling object.Īn object may call a method on itself (e.g., this.m() or just m()). Each invocation is shown with a solid arrow, from the calling object to the called object. Method Calls and Returnsīesides the objects and their life lines, the diagram also shows method invocations and returns. In Java, we can consider that an object dies when it becomes unreachable (when there are no more references to it). For any object, the life line ends at the point in time the object dies (or at the bottom of the diagram, if the object survives the duration of the diagram). If an object does not yet exist at the beginning, but gets created in the middle of the execution, its box appears somewhere between the top and bottom of the diagram, and its life line also starts from the bottom of its box. Starting from the bottom of each box, draw a “life line” that represents the life of the object. Objects and Life LinesĪt the top of the diagram, draw a box for each object that already exists when the period of time represented by the diagram starts. In the diagram, time goes from the top to the bottom. This sequence diagram represents what could happen in a call to Game.simulateStep():Ī sequence diagram shows the execution of a program during a certain period of time (not necessarily starting when the program starts, but starting when a certain method gets called). ![]()
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