59 lines
1.6 KiB
Java
59 lines
1.6 KiB
Java
// enums/RoShamBo5.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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// Multiple dispatching using an EnumMap of EnumMaps
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// {java enums.RoShamBo5}
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package enums;
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import java.util.*;
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import static enums.Outcome.*;
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enum RoShamBo5 implements Competitor<RoShamBo5> {
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PAPER, SCISSORS, ROCK;
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static EnumMap<RoShamBo5,EnumMap<RoShamBo5,Outcome>>
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table = new EnumMap<>(RoShamBo5.class);
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static {
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for(RoShamBo5 it : RoShamBo5.values())
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table.put(it, new EnumMap<>(RoShamBo5.class));
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initRow(PAPER, DRAW, LOSE, WIN);
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initRow(SCISSORS, WIN, DRAW, LOSE);
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initRow(ROCK, LOSE, WIN, DRAW);
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}
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static void initRow(RoShamBo5 it,
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Outcome vPAPER, Outcome vSCISSORS, Outcome vROCK) {
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EnumMap<RoShamBo5,Outcome> row =
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RoShamBo5.table.get(it);
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row.put(RoShamBo5.PAPER, vPAPER);
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row.put(RoShamBo5.SCISSORS, vSCISSORS);
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row.put(RoShamBo5.ROCK, vROCK);
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}
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@Override public Outcome compete(RoShamBo5 it) {
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return table.get(this).get(it);
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}
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public static void main(String[] args) {
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RoShamBo.play(RoShamBo5.class, 20);
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}
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}
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/* Output:
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ROCK vs. ROCK: DRAW
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SCISSORS vs. ROCK: LOSE
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SCISSORS vs. ROCK: LOSE
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SCISSORS vs. ROCK: LOSE
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PAPER vs. SCISSORS: LOSE
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PAPER vs. PAPER: DRAW
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PAPER vs. SCISSORS: LOSE
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ROCK vs. SCISSORS: WIN
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SCISSORS vs. SCISSORS: DRAW
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ROCK vs. SCISSORS: WIN
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SCISSORS vs. PAPER: WIN
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SCISSORS vs. PAPER: WIN
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ROCK vs. PAPER: LOSE
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ROCK vs. SCISSORS: WIN
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SCISSORS vs. ROCK: LOSE
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PAPER vs. SCISSORS: LOSE
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SCISSORS vs. PAPER: WIN
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SCISSORS vs. PAPER: WIN
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SCISSORS vs. PAPER: WIN
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SCISSORS vs. PAPER: WIN
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*/
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