A Software Engineer Learns Java and Object Orientated Programming by Cameron Dane

Author:Cameron, Dane [Cameron, Dane]
Language: eng
Format: epub
Publisher: Cisdal
Published: 2015-03-25T22:00:00+00:00

class Circle implements Shape {

@Override

public void visit(WordDocument wd) {

System.out.println("Printing a circle on a Word Document");

}

@Override

public void visit(PDFDocument pdf) {

System.out.println("Printing a circle on a PDF Document");

}

}

class Square implements Shape {

@Override

public void visit(WordDocument wd) {

System.out.println("Printing a square on a Word Document");

}

@Override

public void visit(PDFDocument pdf) {

System.out.println("Printing a square on a PDF Document");

}

}

In this case, when a Shape visits a Document it simply prints the fact that it has done so. In a real program, the Shape would implement the necessary functionality to draw itself into the specific type of document

The document type hierarchy can then be added as follows:

package visitor;

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