Scala class members and constructor parameters name clash

Question

Consider the following class written in Java:

class NonNegativeDouble {
    private final double value;
    public NonNegativeDouble(double value) {
        this         


        

Answer 1

You can consider parametric field

class NonNegativeDouble(val value: Double, private val name: String ){
  if (value < 0) throw new IllegalArgumentException("value cannot be negative")
  override def toString = 
    "NonNegativeDouble(value = %s, name = %s)" format (value, name)
}

val tom = "Tom"
val k = -2.3

val a = new NonNegativeDouble(k.abs, tom)
a: NonNegativeDouble = NonNegativeDouble(value = 2.3, name = Tom)

a.value
res13: Double = 2.3

a.name
:12: error: value name in class NonNegativeDouble cannot be accessed in NonNegativeDouble
     a.name

val b = new NonNegativeDouble(k, tom)
java.lang.IllegalArgumentException: value cannot be negative
...

It's defines fields and parameters with the same names "value", "name". You can add modifiers such as private ...