59 lines
1.8 KiB
Java
59 lines
1.8 KiB
Java
// containersindepth/MapDataTest.java
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// ©2016 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://mindviewinc.com/Books/OnJava/ for more book information.
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import java.util.*;
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import java.util.function.*;
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import onjava.*;
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class Letters implements Supplier<Pair<Integer,String>>,
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Iterable<Integer> {
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private int size = 9;
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private int number = 1;
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private char letter = 'A';
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@Override
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public Pair<Integer,String> get() {
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return new Pair<>(number++, "" + letter++);
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}
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@Override
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public Iterator<Integer> iterator() {
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return new Iterator<Integer>() {
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@Override
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public Integer next() { return number++; }
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@Override
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public boolean hasNext() { return number < size; }
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@Override
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public void remove() {
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throw new UnsupportedOperationException();
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}
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};
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}
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}
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public class MapDataTest {
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public static void main(String[] args) {
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// Pair Supplier:
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System.out.println(MapData.map(new Letters(), 11));
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// Two separate generators:
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System.out.println(
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MapData.map(new CountingSupplier.Character(),
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new RandomSupplier.String(3), 8));
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// A key Supplier and a single value:
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System.out.println(
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MapData.map(new CountingSupplier.Character(),
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"Value", 6));
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// An Iterable and a value Supplier:
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System.out.println(MapData.map(new Letters(),
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new RandomSupplier.String(3)));
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// An Iterable and a single value:
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System.out.println(MapData.map(new Letters(), "Pop"));
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}
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}
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/* Output:
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{1=A, 2=B, 3=C, 4=D, 5=E, 6=F, 7=G, 8=H, 9=I, 10=J, 11=K}
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{a=YNz, b=brn, c=yGc, d=FOW, e=ZnT, f=cQr, g=Gse, h=GZM}
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{a=Value, b=Value, c=Value, d=Value, e=Value, f=Value}
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{1=mJM, 2=RoE, 3=suE, 4=cUO, 5=neO, 6=EdL, 7=smw, 8=HLG}
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{1=Pop, 2=Pop, 3=Pop, 4=Pop, 5=Pop, 6=Pop, 7=Pop, 8=Pop}
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*/
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