Scala-从Java中反射性地调用私有静态方法

Question

I'm trying to take a private static method from a Java class and invoke it in Scala. Here's the code I have so far:

val blockClass = classOf[Block]
val aMethod: Method = blockClass.getDeclaredMethod("a", Integer.TYPE, classOf[String], classOf[Block])
aMethod.setAccessible(true)

aMethod.invoke(null, 145, "anvil", anvilPatch)

When I try to compile this, however, I get this error:

Error: the result type of an implicit conversion must be more specific than AnyRef
aMethod.invoke(null, 145, "anvil", null)
                     ^

That 145 is supposed to be a Java int , and Integer.TYPE is the only thing I could think of to get a Java int .

Any ideas?

Answer 1

不知道为什么会发生错误，但是可以通过将145显式地强制转换为AnyRef （与Object相同）来解决：

aMethod.invoke(null, 145.asInstanceOf[AnyRef], "anvil", anvilPatch)

Answer 2

Instead of using Integer.TYPE , try using classOf[Int] . This will get you the class object of Scala's Int type.

val aMethod: Method = blockClass.getDeclaredMethod("a", classOf[Int], classOf[String], classOf[Block])