29 lines
917 B
Java
29 lines
917 B
Java
package visitor;
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/**
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* Concrete Visitor 2 — calculates perimeter.
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* Adding this visitor added zero code to Shape, Circle, Rectangle, Triangle.
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*/
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public class PerimeterCalculator implements ShapeVisitor {
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@Override
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public void visit(Circle c) {
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double p = 2 * Math.PI * c.getRadius();
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System.out.printf(" Perimeter of %s = %.2f%n", c.getName(), p);
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}
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@Override
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public void visit(Rectangle r) {
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double p = 2 * (r.getWidth() + r.getHeight());
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System.out.printf(" Perimeter of %s = %.2f%n", r.getName(), p);
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}
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@Override
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public void visit(Triangle t) {
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// Simplified: assume isoceles — base + 2 equal sides approximated
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double side = Math.sqrt(Math.pow(t.getBase() / 2, 2) + Math.pow(t.getHeight(), 2));
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double p = t.getBase() + 2 * side;
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System.out.printf(" Perimeter of %s = %.2f%n", t.getName(), p);
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}
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}
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