OnJava8-Examples/enums/cartoons/EnumImplementation.java

// enums/cartoons/EnumImplementation.java
// (c)2020 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.
// An enum can implement an interface
// {java enums.cartoons.EnumImplementation}
package enums.cartoons;
import java.util.*;
import java.util.function.*;

enum CartoonCharacter
implements Supplier<CartoonCharacter> {
  SLAPPY, SPANKY, PUNCHY,
  SILLY, BOUNCY, NUTTY, BOB;
  private Random rand =
    new Random(47);
  @Override
  public CartoonCharacter get() {
    return values()[rand.nextInt(values().length)];
  }
}

public class EnumImplementation {
  public static <T> void printNext(Supplier<T> rg) {
    System.out.print(rg.get() + ", ");
  }
  public static void main(String[] args) {
    // Choose any instance:
    CartoonCharacter cc = CartoonCharacter.BOB;
    for(int i = 0; i < 10; i++)
      printNext(cc);
  }
}
/* Output:
BOB, PUNCHY, BOB, SPANKY, NUTTY, PUNCHY, SLAPPY, NUTTY,
NUTTY, SLAPPY,
*/