85 lines
2.5 KiB
Java
85 lines
2.5 KiB
Java
// patterns/recyclec/RecycleC.java
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// (c)2017 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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// Adding more objects to the recycling problem
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// {java patterns.recyclec.RecycleC}
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package patterns.recyclec;
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import patterns.trash.*;
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import java.util.*;
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// A List that admits only the right type:
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class Tbin<T extends Trash> extends ArrayList<T> {
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Class<T> binType;
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Tbin(Class<T> type) {
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binType = type;
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}
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@SuppressWarnings("unchecked")
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boolean grab(Trash t) {
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// Comparing class types:
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if(t.getClass().equals(binType)) {
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add((T)t); // Downcast to this TBin's type
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return true; // Object grabbed
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}
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return false; // Object not grabbed
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}
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}
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class TbinList<T extends Trash>
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extends ArrayList<Tbin<? extends T>> { // [1]
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boolean sort(T t) {
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for(Tbin<? extends T> ts : this)
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if(ts.grab(t))
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return true;
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return false; // bin not found for t
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}
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void sortBin(Tbin<T> bin) { // [2]
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for(T aBin : bin)
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if(!sort(aBin))
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System.err.println("Bin not found");
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}
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}
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public class RecycleC {
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static Tbin<Trash> bin = new Tbin<>(Trash.class);
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public static void main(String[] args) {
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// Fill up the Trash bin:
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ParseTrash.fillBin("trash", bin);
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TbinList<Trash> trashBins = new TbinList<>();
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trashBins.add(new Tbin<>(Aluminum.class));
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trashBins.add(new Tbin<>(Paper.class));
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trashBins.add(new Tbin<>(Glass.class));
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// add one line here: [*3*]
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trashBins.add(new Tbin<>(Cardboard.class));
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trashBins.sortBin(bin); // [4]
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trashBins.forEach(Trash::sumValue);
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Trash.sumValue(bin);
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}
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}
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/* Output: (First and Last 10 Lines)
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Loading patterns.trash.Glass
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Loading patterns.trash.Paper
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Loading patterns.trash.Aluminum
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Loading patterns.trash.Cardboard
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weight of patterns.trash.Aluminum = 89.0
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weight of patterns.trash.Aluminum = 76.0
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weight of patterns.trash.Aluminum = 25.0
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weight of patterns.trash.Aluminum = 34.0
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weight of patterns.trash.Aluminum = 27.0
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weight of patterns.trash.Aluminum = 18.0
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...________...________...________...________...
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weight of patterns.trash.Aluminum = 93.0
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weight of patterns.trash.Glass = 93.0
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weight of patterns.trash.Paper = 80.0
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weight of patterns.trash.Glass = 36.0
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weight of patterns.trash.Glass = 12.0
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weight of patterns.trash.Glass = 60.0
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weight of patterns.trash.Paper = 66.0
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weight of patterns.trash.Aluminum = 36.0
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weight of patterns.trash.Cardboard = 22.0
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Total value = 1086.0599818825722
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*/
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