枚举学习

Enum

public enum MyEnum {
    SPRING("春天"),
    WINTER("冬天"),
    SUMMER("夏天"),
    AUTUMN("秋天");
    private String info;
    private MyEnum(String info){
        this.info=info;
    }
    public String getInfo(){
        return info;
    }
    public static void main(String[] args){
        for(MyEnum myEnum:MyEnum.values()){
            System.out.print(myEnum.getInfo()+" ");
        }
        System.out.println(" ");
        for(MyEnum myEnum:MyEnum.values()){
            System.out.print(myEnum.compareTo(MyEnum.AUTUMN)+" ");
            System.out.print(myEnum.equals(MyEnum.AUTUMN)+" ");
            System.out.print(myEnum==MyEnum.AUTUMN);
            System.out.print(" ");
            System.out.print("ordinal: "+myEnum.ordinal());
            System.out.println("");
        }
    }
}

春天 冬天 夏天 秋天

-3 false false ordinal: 0

-2 false false ordinal: 1

-1 false false ordinal: 2

0 true true ordinal: 3

Enum实现了Comparable和Serializable，故可以使用Comparable的compareTo方法

相等返回0，小于参数返回负数，大于参数返回正数