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Object-Oriented Design with UML and Java else ConsoleIO.out.println( Line 2 is not vertical ); ConsoleIO.out.println( Line 1 length: + line1.getLength()); } } Continuing with this theme of object composition, let us introduce a class Line that describes a line comprising a series of connected line segments. Such a class will require a storage structure to [...]

Appendix F: Programming with Java public Point getFinish() { return theFinish; } public boolean isHorizontal() { return (theStart.getY() == theFinish.getY()); } public boolean isVertical() { return (theStart.getX() == theFinish.getX()); } public double getLength() { int xDiff = theStart.getX() – theFinish.getX(); int xSquared = xDiff * xDiff; int yDiff = theStart.getY() – theFinish.getY(); int ySquared = [...]

Object-Oriented Design with UML and Java of object composition: one object composed of other objects. For example, the class LineSegment might be introduced to represent a line in a two-dimensional coordinate space. One Point attribute represents the start of the line, the other Point the end of the segment. Figure F.1 shows the arrangement. Note [...]

Appendix F: Programming with Java 369 and: public class Point { public Point(int x, int y) { theXCoordinate = x; theYCoordinate = y; } public Point() { this(0, 0); } public int getX() { return theXCoordinate; } public int getY() { return theYCoordinate; } public static final Point ZERO = new Point(); // —– Attributes [...]

Appendix F: Programming with Java public int getX() { return theXCoordinate; } public int getY() { return theYCoordinate; } // —– Attributes —————-private int theXCoordinate; private int theYCoordinate; } It is useful to be clear about the order of initialization including a constructor call. We create an instance of a class with a statement of [...]

Object-Oriented Design with UML and Java public int getX() { return this.x; } public int getY() { return this.y; } // —– Attributes —————-private int x; private int y; } Class methods, including constructors, may be overloaded to offer various method definitions having the same name. Overloaded methods must be distinguished by the number and/or [...]

Appendix F: Programming with Java ConsoleIO.out.println( The X coordinate is: + p.getX()); ConsoleIO.out.println( The Y coordinate is: + p.getY()); } } and: public class Point { public Point(int x, int y) { theXCoordinate = x; theYCoordinate = y; } public int getX() { return theXCoordinate; } public int getY() { return theYCoordinate; } // —– [...]

364 Object-Oriented Design with UML and Java A message in Java specifies the identifier (reference) of the recipient object (p) and the operation (getX()), separated by the period (.) symbol. Since the operation requires no parameters (see later) then the parentheses are left empty. The value delivered by this message is stored in the primitive [...]

Appendix F Programming with Java This appendix visits some of the prerequisite Java programming knowledge required by this textbook. We do not intend this and the following appendix to be a detailed study of Java. Rather, we remind the reader of those language constructs that will figure prominently in our development of the study of [...]

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