class Double is abstract; cannot be instantiated in scala

Question

object demo 
{
  def main(args:Array[String]):Unit=
  {
      val temp: LinkedHashMap[String,Object]=new 
      LinkedHashMap[String,Object]()
      temp.put("apple", new Double(1));
      // here i received error since double is abstract class and cannot instantitaed
   }
}

Error i received was due to abstract class instance i want to instance a integer how to achieve this

If you wanted to pass Java's class Double you should change it like so: `new Double(1)` to `new java.lang.Double(1)` — Duelist, Jul 23 '18 at 11:11

score 2 · Accepted Answer · edited Jul 23 '18 at 11:43

if you want a scala.Double, read on. If you want a java Double, see Duelist's comment

To create a Double, you can add the decimal point, as

1.0

where the compiler will infer it's a Double. Or, if you have a value val a: Int = 1, you can provide an explicit type as

a: Double

or convert

a.toDouble

However, if you want an integer instance (as you said), then just use 1. The compiler will infer it's an Int

class Double is abstract; cannot be instantiated in scala

1 Answers1