List and include the usage of the symbols used in the following Unified Modeling Language (UML) diagrams:Class DiagramSequence DiagramUse Case Diagram

Sure, here are the symbols used in the mentioned UML diagrams and their usage:

1. Class Diagram:

   • Class: It's represented by a rectangle with three sections: the top section shows the class's name; the middle section contains the attributes of the class; the bottom section contains the methods or operations that the class can perform.
   • Association: It's represented by a line connecting two classes, showing the relationship between them.
   • Aggregation: It's represented by a hollow diamond at one end of an association, indicating a "whole-part" relationship.
   • Composition: It's represented by a filled diamond at one end of an association, indicating a strong "whole-part" relationship.
   • Generalization: It's represented by a hollow arrowhead pointing to a superclass, indicating an "is-a" relationship.
   • Multiplicity: It's represented by numbers at the end of an association line, indicating how many instances of a class can be associated with an instance of another class.

2. Sequence Diagram:

   • Object: It's represented by a rectangle containing the object's name.
   • Lifeline: It's represented by a dashed line descending from an object, indicating the object's life during the interaction.
   • Activation: It's represented by a thin rectangle on a lifeline, indicating the period during which an object is performing an action.
   • Message: It's represented by a solid arrow from one lifeline to another, indicating the communication between objects.
   • Return Message: It's represented by a dashed arrow with an open arrowhead, indicating the return of control from a called object.
   • Destruction: It's represented by a cross at the end of a lifeline, indicating the end of an object's life.

3. Use Case Diagram:

   • Actor: It's represented by a stick figure, indicating a user or any other system that interacts with the system.
   • Use Case: It's represented by an oval, indicating a specific function or process within the system.
   • Association: It's represented by a line between an actor and a use case, indicating the interaction between them.
   • Include: It's represented by a dashed arrow with an open arrowhead pointing to a use case, indicating that the use case includes the behavior of another use case.
   • Extend: It's represented by a dashed arrow with an open arrowhead pointing from a use case, indicating that the use case extends the behavior of another use case.
   • Generalization: It's represented by a solid line with a hollow arrowhead pointing to a use case or an actor, indicating a generalization relationship.