枚举enum

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;
    }
 
    @Override
    public 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]);
        }