Select 基于 class 成员的适当枚举 class

Question

我有一个摘要 class 描述了 children classes 的一般功能。当我初始化 child class 时，我想将特定枚举 class 设置为 parent 摘要 class 的成员。我该怎么做？

示例： AbstractFunctionality.java

public abstract class AbstractFunctionality {
    protected String Name;
    protected String Surname;
    // specific enum class

    public AbstractFunctionality(String Name, String Surname){
         this.Name = Name;
         this.Surname = Surname;
    }
}

Child1.java

public class Child1 extends AbstractFunctionality {
    public Child1(){
        super("Jane","Austen");
    }
}

如何指定我想要 Child1 class 中的 public enum Writers？

Answer 1

也许你可以在抽象中设置泛型class

public abstract class AbstractFunctionality<T extends Enum<T>> {
    protected String Name;
    protected String Surname;
    T specificEnum

    public AbstractFunctionality(String Name, String Surname,T specificEnum){
         this.Name = Name;
         this.Surname = Surname;
         this.specificEnum=specificEnum;
    }

在子class

public class Child1 extends AbstractFunctionality<Writers> {
    public Child1(){
        super("Jane","Austen",Writers.POEM);
    }
}
}

Answer 2

更简单的方法是将enum类型添加为摘要字段参数的类型class:

public abstract class AbstractFunctionality {
    protected String Name;
    protected String Surname;
    Writers writers;

    public AbstractFunctionality(String Name, String Surname, Writers writers){
        this.Name = Name;
        this.Surname = Surname;
        this.writers = writers;
    }
}

子class:

public class Child1 extends AbstractFunctionality {
    public Child1(){
        super("Jane","Austen", Writers.SOME_FIELD);
    }
}

或者，您可以让您的枚举 Writers 实现一个更通用的 interface 让我们说 IWriters

public abstract class AbstractFunctionality {
    protected String Name;
    protected String Surname;
    protected IWriters writers;

    public AbstractFunctionality(String Name, String Surname, IWriters writers){
         this.Name = Name;
         this.Surname = Surname;
         this.writers = writers;
    }
}

界面：

public interface IWriters {
     ... 
}

枚举：

public enum Writers implements IWriters{
    ...
}

这种方法的好处是您可以让不同的枚举类型实现相同的接口，因此它们也可以用于抽象 class。

Select 基于 class 成员的适当枚举 class

Select appropriate enum class based on class member

java

enums

extends