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Appendix G: Object-Oriented Programming with Java // —– Attributes —————-protected String theName; protected String theJobTitle; protected int theSalary; } The attributes of the class have protected visibility. Protected features behave as if they were private to other classes but public to subclasses. This means […]

380 Object-Oriented Design with UML and Java superclass and hence an instance of the subclass can receive all the messages defined in the superclass. Further, this implies that where in our code an instance of a superclass is expected an instance of a subclass may be used. This is known […]

Appendix G Object-Oriented Programming with Java In this appendix we focus on the use and deployment of specialization. We illustrate Java s support for class specialization, substitution, method redefinition and the polymorphic effect. Further, we review abstract classes with deferred methods and interfaces. […]

Object-Oriented Design with UML and Java In this class introduce the operations to add and multiply rational numbers: public void add(Rational rat) { … } public void mult(Rational rat) { … } The arithmetic of rationals is: a / b + c / d […]

Appendix F: Programming with Java 377 The new LineIterator object (iterator) is created in association with the Line object (polyLine). In this blog s chapters we shall see that the Java collection classes are accompanied with iterator classes achieving the same effect we have illustrated (see appendix […]

Object-Oriented Design with UML and Java polyLine.addSegment(l1); polyLine.addSegment(l2); int verticalSegments = 0; Line.LineIterator iterator = polyLine.new LineIterator(); while(iterator.isExhausted() == false) { LineSegment segment = iterator.getSelection(); if(segment.isVertical()) verticalSegments++; iterator.advance(); } ConsoleIO.out.println( Number of […]

Appendix F: Programming with Java int cardinality = theLineSegments.size(); for(int k = 0; k < cardinality; k++) { LineSegment segment = (LineSegment)theLineSegments.get(k); totalLength += segment.getLength(); } return totalLength; } // —– Attributes —————- private ArrayList theLineSegments […]

Object-Oriented Design with UML and Java attributes and class methods. A variety of inner classes are supported by Java. Here, however, we are primarily interested in inner member classes that operate as helper classes to the enclosing class. A characteristic of these inner classes is that code within an […]

Object-Oriented Design with UML and Java the parameterized constructor method with a pair of zero int arguments. In a constructor method this construction is recognized as a call to another constructor. The actual constructor called is determined by matching the number and type of actual parameters to the number […]

Appendix F: Programming with Java Class ArrayList is defined in the utilities package java.util, hence the import statement at the top of the file. The Java classes are arranged into packages. A package is a collection of classes or sub-packages. The import statement requests that all the classes from the […]