在Java中投射类 [英] Cast a class in Java

问题描述

基本投放应

MyClass mc =（MyClass）aClass

这很容易

但是根据我的程序，我不知道类名直到运行时。

例如，类名可以是interp_0，interp_1，interp_2，interp_3 .......＃;

现在我得到的是

Class afterCast = Class.forName（Interp_+ countState）;

但我想要的是

（Interp_+ countState）afterCast

不

类afterCast

/ p>

感谢所有帮助我的人。

解决方案

我建议使用所有这些类实现的接口，这些接口包含您需要的方法。然后可以转换到此接口。我不明白为什么这应该做不同，因为你知道哪些方法，你期望在那些对象是一个接口实际上。

basic casting should be

MyClass mc = (MyClass)aClass

that is easy

but based on my program, I don't know the class name until runtime.

for example, the class name could be interp_0, interp_1, interp_2, interp_3 .......#;

Is there anyway in java that I could use to cast it?

For now All I got is

Class afterCast = Class.forName("Interp_" + countState);

but what I want is

("Interp_" + countState) afterCast

, not

Class afterCast

.

Thanks for all of you who help me. It is so quick than I expected.

解决方案

I would suggest using an interface implemented by all these classes which contains the methods you need. You can then cast to this interface. I don't see why this should be done different because you know which methods you expect at those objects which is an interface actually.

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