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enum class Planet(mass: Double, radius: Double) {
private final val G = 6.67300E-11
def surfaceGravity = G * mass / (radius * radius)
def surfaceWeight(otherMass: Double) = otherMass * surfaceGravity
}
object Planet {
case MERCURY extends Planet(3.303e+23, 2.4397e6)
case VENUS extends Planet(4.869e+24, 6.0518e6)
case EARTH extends Planet(5.976e+24, 6.37814e6)
case MARS extends Planet(6.421e+23, 3.3972e6)
case JUPITER extends Planet(1.9e+27, 7.1492e7)
case SATURN extends Planet(5.688e+26, 6.0268e7)
case URANUS extends Planet(8.686e+25, 2.5559e7)
case NEPTUNE extends Planet(1.024e+26, 2.4746e7)
}
object Test {
def main(args: Array[String]) = {
import Planet._
assert(enumValueNamed("SATURN") == SATURN)
assert(enumValue(2) == EARTH)
val earthWeight = 100
val mass = earthWeight/EARTH.surfaceGravity
for (p <- enumValues)
println(s"Your weight on $p is ${p.surfaceWeight(mass)}")
}
}
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