27 lines
764 B
Java
27 lines
764 B
Java
package visitor;
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/**
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* Concrete Visitor 1 — calculates area for each shape type.
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* Area formulas live here, not scattered across shape classes.
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*/
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public class AreaCalculator implements ShapeVisitor {
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@Override
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public void visit(Circle c) {
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double area = Math.PI * c.getRadius() * c.getRadius();
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System.out.printf(" Area of %s = %.2f%n", c.getName(), area);
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}
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@Override
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public void visit(Rectangle r) {
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double area = r.getWidth() * r.getHeight();
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System.out.printf(" Area of %s = %.2f%n", r.getName(), area);
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}
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@Override
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public void visit(Triangle t) {
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double area = 0.5 * t.getBase() * t.getHeight();
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System.out.printf(" Area of %s = %.2f%n", t.getName(), area);
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}
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}
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