63 lines
1.5 KiB
Java
63 lines
1.5 KiB
Java
//: patterns/recycleb/RecycleB.java
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// Adding more objects to the recycling problem.
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package patterns.recycleb;
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import patterns.trash.*;
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import java.util.*;
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// A vector that admits only the right type:
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class Tbin<T> extends ArrayList<T> {
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Class binType;
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Tbin() {
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this.binType = binType;
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}
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boolean grab(T t) {
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// Comparing class types:
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if(t.getClass().equals(binType)) {
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add(t);
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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 extends ArrayList { //(*1*)
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@SuppressWarnings("unchecked")
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boolean sort(Trash t) {
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Iterator e = iterator();
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while(e.hasNext()) {
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Tbin bin = (Tbin)e.next();
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if(bin.grab(t)) return true;
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}
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return false; // bin not found for t
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}
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void sortBin(Tbin bin) { // (*2*)
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Iterator e = bin.iterator();
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while(e.hasNext())
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if(!sort((Trash)e.next()))
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System.out.println("Bin not found");
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}
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}
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public class RecycleB {
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static Tbin<Trash> bin = new Tbin<>();
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@SuppressWarnings("unchecked")
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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.dat", bin);
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TbinList trashBins = new TbinList();
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trashBins.add(new Tbin<Aluminum>());
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trashBins.add(new Tbin<Paper>());
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trashBins.add(new Tbin<Glass>());
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// add one line here: (*3*)
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trashBins.add(new Tbin<Cardboard>());
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trashBins.sortBin(bin); // (*4*)
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Iterator<Tbin> e = trashBins.iterator();
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while(e.hasNext())
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Trash.sumValue(e.next());
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Trash.sumValue(bin);
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}
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} ///:~
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