如何将枚举值传递给构造函数

Question

protected enum Category { Action, Fiction, Drama, Romance, SciFi, Poems, Kids } 

我创建了这个enum类型,现在我必须为我的类创建一个构造函数.

public Book(String title, int code, List<String> authors, String publisher, int year, Category categ){
        this.title = title;
        this.code = code;
        this.authors = authors;
        this.publisher = publisher;
        this.year = year;
        this.category = ....;
}

我不明白我将如何向构造函数传递枚举类型的值.

有人可以帮忙吗？

我知道这是初学者的问题,但我似乎无法在任何地方找到答案.

Answer 1

像这样的东西

new Book( title, ........ ,Category.anyEnumConstant);

例如:

   Book book=  new Book( title, ........ ,Category.Fiction);

然后在构造函数内部

 this.category = categ;

Answer 2

您既可以发送枚举,也可以发送字符串并使用valueOf()来获取Enum.

解决方案1:发送枚举.

new Book(title, code, authors, publisher, year, Category.Action);

在你的构造函数中,

public Book(String title, int code, List<String> authors, String publisher, int year, Category categ){
    ...
    this.category = categ;
}

解决方案2:发送一个字符串值并使用它valueOf()来获取它的枚举.

new Book(title, code, authors, publisher, year, "Action");

在你的构造函数中,

public Book(String title, int code, List<String> authors, String publisher, int year, String categString){
    ....
    this.category = Category.valueOf(categString);
}