泛型方法重载 [英] Method overloading with generics
问题描述
在尝试创建两个静态重载方法时，出现编译错误.谁能解释一下?
Where I try to create two static overloading methods I got an compilation error. Can anyone explain this?
public class A {
public static void a(Set<String> stringSet) {}
public static void a(Set<Map<String,String>> mapSet) {}
}
推荐答案
原因是类型擦除.泛型没有存储在类中，它们只是编译时信息，因此在运行时，这两种方法是相同的，因此存在命名冲突.
The reason is type erasure. Generics are not stored in the classes, they are compile-time info only, so at runtime, the two methods are identical and hence there is a naming conflict.
参考
- Generics section of the Sun Java Tutorial
- Java Generics and Collections (Book)
这三种方法实际上是相同的(阅读:它们产生相同的字节码):
These three methods are actually identical (read: they produce identical bytecode):
public static void a(Set plainSet) {}
public static void a(Set<String> stringSet) {}
public static void a(Set<Map<String,String>> mapSet) {}
如果您确实想拥有两个单独的方法，则必须提供不同的方法签名(例如，不同的方法名称，其中一个方法的附加参数等)
If you really want to have two separate methods, you must provide different method signatures (e.g. different method names, an additional parameter for one of the methods etc.)
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