JHawk List of Metrics

JHawk collects metrics at four different levels. The lowest level is the method level, then up to the class level, then the package level then, finally, the system level. The method, class and package levels correlate with the Java artefacts with these names. The 'system' level represents a group of these artefacts that you wish to examine collectively e.g. all the code in an application. Full documentation relating to the calculation of these metrics is supplied with the product.

Metrics collected at the method level

Metric name	Metric description
Name	The name of the method
Cyclomatic Complexity	McCabes cyclomatic Complexity for the method
Number of Arguments	Number of Arguments
Number of Comments	The number of Comments associated with the method
Number of Comment Lines	The number of Comment Lines associated with the method
Variable Declarations	The number of variables declared in the method
Variable References	The number of variables referenced in the method
Number of statements	The number of statements in the method
Number of expressions	The number of expressions in the method
Max depth of nesting	The maximum depth of nesting in the method
Halstead length	The Halstead length of the metric
Halstead vocabulary	The Halstead vocabulary of the method
Halstead volume	The Halstead volume of the method
Halstead difficulty	The Halstead difficulty of the method
Halstead effort	The Halstead effort of the method
Halstead bugs	The Halstead prediction of the number of bugs in the method
Total depth of nesting	The total depth of nesting in the method
Number of casts	The number of class casts in the method
Number of loops	The number of loops (for, while) in the method
Number of operators	The total number of operators in the method
Number of operands	The total number of operands in the method
Class References	The classes referenced in the method
External methods	The external methods called by the method
Local methods	The local methods called by the method
Exceptions referenced	The exceptions referenced by the method
Exceptions thrown	The exceptions thrown by the method
Modifiers	The modifiers (static, public etc) applied to the signature of the method
Lines of Code	The number of lines of code in the method

Metrics collected at the class level

Metric name	Metric description
Name	The name of the class
Superclass Name	The name of the superclass of the class
Number of methods	The number of methods in the class
LCOM	The value of the LCOM (Lack of Cohesion of Methods) metric for the class. This uses the LCOM* (or LCOM5) calculation
Total Cyclomatic Complexity	The Total McCabes cyclomatic Complexity for the class
Average Cyclomatic Complexity	The Average McCabes cyclomatic Complexity for all of the methods inthe class
Number of statements	The number of statements in the class
Cumulative Halstead length	The Halstead length of the code in the class plus the total of all the Halstead lengths of all the methods in the class
Cumulative Halstead volume	The Halstead volume of the code in the class plus the total of all the Halstead volumes of all the methods in the class
Cumulative Halstead effort	The Halstead effort of the code in the class plus the total of all the Halstead efforts of all the methods in the class
Cumulative Halstead bugs	The Halstead prediction of the number of bugs in the code of the class and all of its methods
Un Weighted class Size	The Unweighted Class Size (UWCS) of the class
Number of Queries	The number of methods in the class that are queries (i.e. that return a value)
Number of Commands	The number of methods in the class that are commands (i.e. that do not return a value)
External method calls	The external methods called by the class and by methods in the class
Hierarchy method calls	The methods called by the class and by methods in the class
Local method calls	The local methods called by the class and by methods in the class that are defined in the hierarchy of the class
Instance Variables	The instance variables defined by the class
Modifiers	The modifiers (public, protected etc) applied to the declaration of the class
Interfaces	The interfaces implemented by the class
Packages imported	The packages imported by the class
Response for Class	The value of the Response For Class (RFC) metric for the class
Message passing	The value of the Message passing (MPC) metric for the class
Coupling between objects	The value of the Coupling Between Objects (CBO) metric for the class
Fan In	The value of the Fan In (Afferent coupling (Ca)) metric for the class
Fan Out	The value of the Fan Out (Efferent coupling (Ce)) metric for the class
Reuse Ratio	The value of the Reuse Ratio for the class
Specialization Ratio	The value of the Specialization Ratio for the class
Superclasses	The number of superclasses (excluding Object) in the hierarchy of the class
Subclasses	The number of subclasses below the class in the hierarchy
Maintainability Index (including comments)	The Maintainability Index for the class, including the adjustment for comments
Maintainability Index	The Maintainability Index for the class without any adjustment for comments
Cohesion	The value of the Cohesion (COH) metric for the class
Depth of Inheritance Tree	The value of the Depth of Inheritance Tree (DIT) metric for the class
LCOM2	The value of the Lack of Cohesion of Methods (2) (LCOM2) metric for the class
SIX	The value of the SIX metric for the class
Number of Comments	The number of Comments associated with the class
Number of Comment Lines	The number of Comment Lines associated with the class
Cumulative Number of Comments	The number of Comments associated with the class and its method
CumulativeNumber of Comment Lines	The number of Comment Lines associated with class and its methods
Lines of Code	The number of lines of code in the class and its methods

Metrics collected at the package level

Metric name	Metric description
Name	The name of the package
Number of classes	The number of classes in the package
Number of methods	The number of methods in the package
Number of statements	The number of statements in the package
Total Cyclomatic Complexity	The Total McCabes cyclomatic Complexity for the package
Average Cyclomatic Complexity	The Average McCabes cyclomatic Complexity for all of the methods in the package
Cumulative Halstead length	The total of all the Halstead lengths of all the classes in the package
Cumulative Halstead volume	The total of all the Halstead volumes of all the classes in the package
Cumulative Halstead effort	The total of all the Halstead efforts of all the classes in the package
Cumulative Halstead bugs	The Halstead prediction of the number of bugs in the code of all classes in the package
Maintainability Index (including comments)	The Maintainability Index for the package, including the adjustment for comments
Maintainability Index	The Maintainability Index for the package without any adjustment for comments
Abstractness	The value of the Abstractness metric for the package
Fan In	The value of the Fan In metric for the package
Fan Out	The value of the Fan Out metric for the package
Instability	The value of the Instability metric for the package
Distance	The value of the Distance metric for the package
Maximum Cyclomatic Complexity	The maximum value of McCabes cyclomatic Complexity for any method in the package
Cumulative Number of Comments	The number of Comments associated with the package and its classes
CumulativeNumber of Comment Lines	The number of Comment Lines associated with package and its classes
Lines of Code	The number of lines of code in the package and its classes

Metrics collected at the system level

Metric name	Metric description
Name	The name of the System
Number of packages	The number of packages in the system
Number of classes	The number of classes in the system
Number of methods	The number of methods in the system
Number of statements	The number of statements in the system
Total Cyclomatic Complexity	The Total McCabes cyclomatic Complexity for the system/TD>
Average Cyclomatic Complexity	The Average McCabes cyclomatic Complexity for all of the methods in the system
Cumulative Halstead length	The total of all the Halstead lengths of all the packages in the system
Cumulative Halstead volume	The total of all the Halstead volumes of all the packages in the system
Cumulative Halstead effort	The total of all the Halstead efforts of all the packages in the system
Cumulative Halstead bugs	The Halstead prediction of the number of bugs in the code of all packages in the system
Maintainability Index (including comments)	The Maintainability Index for the package, including the adjustment for comments
Maintainability Index	The Maintainability Index for the package without any adjustment for comments
Cumulative Number of Comments	The number of Comments associated with the package and its classes
CumulativeNumber of Comment Lines	The number of Comment Lines associated with package and its classes
Lines of Code	The number of lines of code in the package and its classes

You may be interested in some of our other products. All have demo or trial versions. Just click on the links below to find out more -

Java and all Java-based trademarks are trademarks or registered trademarks of Sun Microsystems Inc.

Eclipse is a trademark of the Eclipse Foundation, Inc.