OnJava8-Examples/enums/RoShamBo1.java

// enums/RoShamBo1.java
// (c)2021 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Demonstration of multiple dispatching
// {java enums.RoShamBo1}
package enums;
import java.util.*;

public class RoShamBo1 {
  static final int SIZE = 20;
  private static Random rand = new Random(47);
  public static Item newItem() {
    switch(rand.nextInt(3)) {
      default:
      case 0: return new Scissors();
      case 1: return new Paper();
      case 2: return new Rock();
    }
  }
  public static void match(Item a, Item b) {
    System.out.println(
      a + " vs. " + b + ": " +  a.compete(b));
  }
  public static void main(String[] args) {
    for(int i = 0; i < SIZE; i++)
      match(newItem(), newItem());
  }
}
/* Output:
Rock vs. Rock: DRAW
Paper vs. Rock: WIN
Paper vs. Rock: WIN
Paper vs. Rock: WIN
Scissors vs. Paper: WIN
Scissors vs. Scissors: DRAW
Scissors vs. Paper: WIN
Rock vs. Paper: LOSE
Paper vs. Paper: DRAW
Rock vs. Paper: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Rock vs. Scissors: WIN
Rock vs. Paper: LOSE
Paper vs. Rock: WIN
Scissors vs. Paper: WIN
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
*/