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CSE 2221 Actual Exam 2024| Study Questions Solved 100% Correc
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CSE 2221 Actual Exam 2024| StudyQuestions Solved 100% Correct
What happens if the precondition is true? - ANSWER If the precondition is true when a
method is called, then the method will run properly and the postcondition will be true when it
returns to the calling program.
What happens if the precondition isn't true? - ANSWER If the precondition isn't true when a
method is called, then the method can do anything (including not terminating which means
the program will be stuck in a sort of infinite loop).
Responsibilities and rewards of the client. - ANSWER The client is responsible for making
sure the precondition is true. Their reward is assuming that the postcondition will be true.
Responsibilities and rewards of the implementer. - ANSWER The implementer is responsible to
make sure that the postcondition is true when the method returns. The implementers reward
is that they may assume the precondition is true when the method is called.
API - ANSWER The documentation that comes from stating pre and post conditions is known
as the API (application programming interface).
Javadoc contracts - ANSWER @param describes the formal parameter
@return describes the returned value
, @requires introduces the precondition
@ensures introduces the postcondition
Trees - ANSWER Each tree is made up of a root node connected to children via branches. Each
child of the root node may act as a root node for its own children.
XML - ANSWER XML is a textual document format used all over the web. XML format is close
to the HTML format with tags and ending tags.
XML Tree to File - ANSWER By looking at the structure of the XML file you are able to create
an XML tree. Any attributes attached to the XML element name will show up in the XML tree.
XML Tree Constructor - ANSWER XMLTree name = new XMLTree1(file name);
Creates XMLTree from the given file name
XML command label (String t = xml.label();) - ANSWER Returns the label of the root of this
XML command isTag (boolean b = xml.isTag();) - ANSWER Returns whether the label of the
root of this is a tag.
XML command hasAttribute(String name) (boolean b = xml.hasAttribute("pubDate");) -
ANSWER Returns whether the root tag of this has an attribute called name.
XML command attribute Value(String Name) (String v = xml.attributeValue("pubDate")); -
ANSWER Returns the value associated with the attribute of the root tag of this called name.
XML command numberOfChildren (int j = xml.numberOfChildren()); - ANSWER Returns the
number of subtrees of the root of this
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