1. 使用enum关键字定义
2. 提供枚举类的对象，多个对象用逗号分开，结尾用分号结束
3. 提供构造方法，给属性赋值
4. 使用public statiac final来修饰是属性
5. 提供get方法
6. 提供toString方法

public enum Season {SPRING("春天", "春暖花开"),SUMMER("夏天", "夏日炎炎"),AUTUMN("秋天", "秋高气爽"),WINTER("冬天", "冰天雪地");private final String seasonName;private final String des;Season(String seasonName, String des) {this.seasonName = seasonName;this.des = des;}public String getSeasonName() {return seasonName;}public String getDes() {return des;}@Overridepublic String toString() {return "Season{" +"seasonName='" + seasonName + '\'' +", des='" + des + '\'' +'}';}
}

 Season[] values = Season.values();for (int i = 0; i < values.length; i++) {System.out.println(values[i]);}

结果

（Thread）源码示例：

public static enum State {NEW,RUNNABLE,BLOCKED,WAITING,TIMED_WAITING,TERMINATED;private State() {}}

Thread.State[] states = Thread.State.values();for (int i = 0; i < states.length; i++) {System.out.println(states[i]);}