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Object Oriented Analysis and Design
Notes Self Assessment
Fill in the blanks:
9. An object remains active after sending a ................ and can reply to other messages without
waiting for a response.
10. ................ objects do not have their own threads of control.
11. An ................ object owns a thread of control.
12. In sequence diagram with transient objects, ................ has a call arrow coming into its top
and a return arrow leaving its bottom.
13. In sequence diagram with passive objects, activation shows the ................ during which a
call of a method is being processed.
8.3 Special Constructs for Activity Models
Activity models include some complex constructs which are discussed below:
Conditional threads
Nested activity diagrams
8.3.1 Conditional Threads
Guard conditions can be used to show that one of a set of concurrent threads is conditional.
Figure 8.7: Conditional Thread
Source: http://gyan.frcrce.ac.in/~surve/OOAD/UCD/UCD_Relationships.html
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