Java 中的自定义隐式转换
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Custom Implicit Conversion in Java
提问by CodeCamper
In C# I can create my own implicit conversion for my classes as follows...
在 C# 中，我可以为我的类创建自己的隐式转换，如下所示...
public static implicit operator TypeYouWantToChangeTo (ClassYouAreChanging c)
{
TypeYouWantToChangeTo x;
//convert c to x
return x;
}
How do you make a class be able to implicitly convert to another class? Also in C# I can change implicit to explicit to also create the ability to cast manually. How do you accomplish this in Java?
你如何让一个类能够隐式转换为另一个类？同样在 C# 中，我可以将隐式更改为显式，以创建手动转换的能力。你如何在 Java 中实现这一点？
采纳答案by DwB
You can not overload operators with Java. Add a method to your class of choice to perform the conversion. For example:
你不能用 Java 重载运算符。向您选择的类添加一个方法来执行转换。例如：
public class Blammy
{
public static final Blammy blammyFromHooty(final Hooty hoot)
{
Blammy returnValue;
// convert from Hooty to Blammy.
return returnValue;
}
}
Edit
编辑
- Only built-in types have implicit conversions.
- Explicit conversion (in java) is called a cast. for example,
int q = 15; double x = (double) q; - There can never be implicit conversions of your custom types.
extendsandimplementsare not conversion.- All implicit conversions are for primitive types.
- 只有内置类型具有隐式转换。
- 显式转换（在 Java 中）称为强制转换。例如，
int q = 15; double x = (double) q; - 您的自定义类型永远不会有隐式转换。
extends并且implements不是转换。- 所有隐式转换都是针对原始类型的。
