105 lines
2.6 KiB
Java
105 lines
2.6 KiB
Java
// patterns/trash/TrashVisitor.java
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// (c)2021 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Related algorithms packaged in
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// each implementation of Visitor.
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// {java patterns.trash.TrashVisitor}
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package patterns.trash;
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import java.util.*;
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class PriceVisitor extends Visitor {
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public PriceVisitor() { super("price"); }
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@Override public void visit(Aluminum al) {
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double price = al.weight * al.price();
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show("Aluminum", price);
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alTotal += price;
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}
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@Override public void visit(Paper p) {
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double price = p.weight * p.price();
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show("Paper", price);
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pTotal += price;
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}
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@Override public void visit(Glass g) {
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double price = g.weight * g.price();
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show("Glass", price);
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gTotal += price;
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}
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@Override public void visit(Cardboard c) {
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double price = c.weight * c.price();
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show("Cardboard", price);
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cTotal += price;
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}
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}
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class WeightVisitor extends Visitor {
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public WeightVisitor() { super("weight"); }
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@Override public void visit(Aluminum al) {
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show("Aluminum", al.weight);
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alTotal += al.weight;
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}
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@Override public void visit(Paper p) {
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show("Paper", p.weight);
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pTotal += p.weight;
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}
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@Override public void visit(Glass g) {
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show("Glass", g.weight);
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gTotal += g.weight;
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}
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@Override public void visit(Cardboard c) {
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show("Cardboard", c.weight);
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cTotal += c.weight;
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}
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}
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public class TrashVisitor {
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public static void main(String[] args) {
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List<Trash> bin = new ArrayList<>();
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ParseTrash.fillBin("trash", bin);
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List<Visitor> visitors = Arrays.asList(
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new PriceVisitor(), new WeightVisitor());
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bin.forEach(
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trash -> visitors.forEach(trash::accept)
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);
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visitors.forEach(Visitor::total);
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}
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}
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/* Output:
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Loading patterns.trash.Cardboard
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Loading patterns.trash.Paper
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Loading patterns.trash.Aluminum
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Loading patterns.trash.Glass
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Cardboard price: 0.48
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Cardboard weight: 4.40
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Paper price: 0.80
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Paper weight: 8.00
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Aluminum price: 3.01
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Aluminum weight: 1.80
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Glass price: 1.24
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Glass weight: 5.40
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Aluminum price: 5.68
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Aluminum weight: 3.40
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Cardboard price: 0.24
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Cardboard weight: 2.20
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Glass price: 0.99
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Glass weight: 4.30
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Cardboard price: 0.13
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Cardboard weight: 1.20
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Paper price: 0.66
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Paper weight: 6.60
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Aluminum price: 4.51
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Aluminum weight: 2.70
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Paper price: 0.91
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Paper weight: 9.10
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Glass price: 0.83
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Glass weight: 3.60
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Total Aluminum price: 13.19
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Total Paper price: 2.37
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Total Glass price: 3.06
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Total Cardboard price: 0.86
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Total Aluminum weight: 7.90
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Total Paper weight: 23.70
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Total Glass weight: 13.30
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Total Cardboard weight: 7.80
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*/
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