What are the relevant knowledge points of Java enumeration
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Define
There are only a limited number of objects in the class.
Week: Monday (Monday),., Sunday (Sunday)
Gender: Man (male), Woman (female)
Season: Spring (Spring Festival). Winter (winter)
Payment methods: Cash (cash), WeChatPay (Wechat), Alipay (Alipay), BankCard (silver)
Bank Card), CreditCard (Credit Card)
Order status: Nonpayment (unpaid), Paid (paid), Delivered (shipped), Return (return), Checked (confirmed) Fulfilled (shipped),
Thread state: create, ready, run, block, die
Enum
The properties of enumerated class objects should not be allowed to be changed, so you should use private final decorations
The private final-decorated properties of the enumerated class should be assigned a value in the constructor
if the enumeration class explicitly defines a constructor with parameters, then the enumeration value must also correspond to the
Incoming parameter
Class Season {name of private final String SEASONNAME;// season description of private final String SEASONDESC;// season private Season (String seasonName,String seasonDesc) {this.SEASONNAME = seasonName;this.SEASONDESC = seasonDesc;} public static final Season SPRING = new Season ("spring", public static final Season SUMMER = new Season ("summer", public static final Season AUTUMN = new Season ("autumn", public static final Season WINTER = new Season ("winter",} "warm spring flowers"); "hot summer"); "crisp autumn") "Snow"); method
The values () method returns an array of objects of enumerated types. This method can easily traverse all the
Enumerated values.
ValueOf (String str): you can convert a string to the corresponding enumerated class object. Required character
The string must be the name of the enumerated class object. If not, there will be a runtime exception: IllegalArgumentException.
ToString (): returns the name of the current enumeration class object constant
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