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Circle

Radius:double

Circle () Circle (newradius:double) Getarea ():d ouble

The Circle line above (UML class diagram) is the class name; The middle radius:double is the data field (the attribute of the Class), the following is the method;

The class is created as follows:

 PackageCom.czj; Public classCircle { Public Doubleradius;  PublicCircle () {} PublicCircle (Doubleradius) {         This. radius=radius; }         Public DoubleGetarea () {return  This. Radius;//return a double on the line        }}

Circle1:circle

radius=12.3

This is called UML object notation.

Learn some JAVA_UML class diagram every day