86 lines
2.0 KiB
Java
86 lines
2.0 KiB
Java
package intersectingNumberWheels;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.stream.IntStream;
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public class WheelController {
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private static final String IS_NUMBER = "[0-9]";
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private static final int TWENTY = 20;
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private static Map<String, WheelModel> wheelMap;
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public static void advance(String wheel) {
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WheelModel w = wheelMap.get(wheel);
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if (w.list.get(w.position).matches(IS_NUMBER)) {
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w.printThePosition();
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w.advanceThePosition();
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} else {
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String wheelName = w.list.get(w.position);
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advance(wheelName);
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w.advanceThePosition();
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}
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}
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public static void run() {
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System.out.println(wheelMap);
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IntStream.rangeClosed(1, TWENTY).forEach(i -> advance("A"));
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System.out.println();
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wheelMap.clear();
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}
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public static void main(String[] args) {
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wheelMap = new HashMap<>();
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wheelMap.put("A", new WheelModel("A", "1", "2", "3"));
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run();
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wheelMap.put("A", new WheelModel("A", "1", "B", "2"));
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wheelMap.put("B", new WheelModel("B", "3", "4"));
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run();
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wheelMap.put("A", new WheelModel("A", "1", "D", "D"));
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wheelMap.put("D", new WheelModel("D", "6", "7", "8"));
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run();
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wheelMap.put("A", new WheelModel("A", "1", "B", "C"));
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wheelMap.put("B", new WheelModel("B", "3", "4"));
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wheelMap.put("C", new WheelModel("C", "5", "B"));
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run();
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}
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}
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class WheelModel {
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String name;
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List<String> list;
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int position;
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int endPosition;
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private static final int INITIAL = 0;
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public WheelModel(String name, String... values) {
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super();
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this.name = name.toUpperCase();
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this.list = new ArrayList<>();
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for (String value : values) {
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list.add(value);
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}
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this.position = INITIAL;
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this.endPosition = this.list.size() - 1;
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}
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@Override
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public String toString() {
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return list.toString();
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}
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public void advanceThePosition() {
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if (this.position == this.endPosition) {
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this.position = INITIAL;// new beginning
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} else {
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this.position++;// advance position
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}
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}
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public void printThePosition() {
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System.out.print(" " + this.list.get(position));
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}
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}
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