enumimplementation.java

来自「《Java编程思想》第四版源代码」· Java 代码 · 共 29 行

//: enumerated/cartoons/EnumImplementation.java
// An enum can implement an interface
package enumerated.cartoons;
import java.util.*;
import net.mindview.util.*;

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

public class EnumImplementation {
  public static <T> void printNext(Generator<T> rg) {
    System.out.print(rg.next() + ", ");
  }
  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,
*///:~