JAVA 枚举单例模式及源码分析的实例详解

public enum Singleton {
  INSTANCE {

    @Override
    protected void read() {
      System.out.println("read");
    }

    @Override
    protected void write() {
      System.out.println("write");
    }

  };
  protected abstract void read();
  protected abstract void write();
}

public abstract class Singleton extends Enum
{

  private Singleton(String s, int i)
  {
    super(s, i);
  }

  protected abstract void read();

  protected abstract void write();

  public static Singleton[] values()
  {
    Singleton asingleton[];
    int i;
    Singleton asingleton1[];
    System.arraycopy(asingleton = ENUM$VALUES, 0, asingleton1 = new Singleton[i = asingleton.length], 0, i);
    return asingleton1;
  }

  public static Singleton valueOf(String s)
  {
    return (Singleton)Enum.valueOf(singleton/Singleton, s);
  }

  Singleton(String s, int i, Singleton singleton)
  {
    this(s, i);
  }

  public static final Singleton INSTANCE;
  private static final Singleton ENUM$VALUES[];

  static 
  {
    INSTANCE = new Singleton("INSTANCE", 0) {

      protected void read()
      {
        System.out.println("read");
      }

      protected void write()
      {
        System.out.println("write");
      }

    };
    ENUM$VALUES = (new Singleton[] {
      INSTANCE
    });
  }
}