How to adjust string to correct input type of classOf in scala?

Question

I want to remove the following import:

import my.package.version.class1

the reason is that I want to pass the version as a parameter so I can have the following options:

my.package.version1.class1
my.package.version2.class1
my.package.version3.class1

When I do it hard-coded like that it works

classOf[my.package.version1.class1].getPackage

But I need it to be a String type so I can append the version each time.

val hh = "my.package."+versionParamater+".class1"



 classOf[hh].getPackage //THIS WONT WORK error: identifier expected but string literal found.

I also tried doing this and it didnt work as well:

 val pkg = Package.getPackage(" my.package.version1.class1");

can you please assist?

oxbow_lakes · Accepted Answer · 2017-02-20 09:46:27Z

3

You will have to revert to the java.lang.Class.forName method to get hold of the class. But note that you will get back a Class<?> rather than a Class<class1>. For example:

scala> Class.forName("java.lang.String")
res0: Class[_] = class java.lang.String

You can cast it, though:

scala> res0.asInstanceOf[Class[String]]
res1: Class[String] = class java.lang.String

A mis-cast will not result in a ClassCastException:

scala> res0.asInstanceOf[Class[Integer]]
res2: Class[Integer] = class java.lang.String

answered Feb 20, 2017 at 9:46

oxbow_lakes

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Comments

prayagupadhyay · Accepted Answer · 2017-02-20 09:49:01Z

1

You can use java.lang.Class.forName(fullClassPackage).

Example,

  val versionParamater = "version1"
  val fullPackage = "my.package."+versionParamater+".class1"
  val versionedClass = Class.forName(fullPackage)
  assert(versionedClass.getSimpleName == "class1")
  assert(versionedClass.getPackage.getName == "my.package.version1")

answered Feb 20, 2017 at 9:49

prayagupadhyay

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