trainer class added

src/main/scala/backend/Pokemon/Capacity.scala

@@ -3,5 +3,5 @@ class Capacity(val name: String, val ctype: Type, val maxUses: Int, private var
     // getter
     def usesLeft: Int = this._usesLeft
 
-    def use() =
+    def use: Unit =
         this._usesLeft = this._usesLeft - 1

src/main/scala/backend/Pokemon/Pokemon.scala

@@ -23,9 +23,9 @@ trait Pokemon(
     def speed: Int = 5 + scala.math.floor(2.0 * this.baseSpeed * this.level / 100.0).toInt
     def maxLife: Int = scala.math.floor(2.0 * this.baseSpeed * this.level / 100.0).toInt + 10 + this.level
 
-    def useCapacity(capacity: Capacity, other: Pokemon) =
+    def useCapacity(capacity: Capacity, other: Pokemon): Unit =
 
-        capacity.use()
+        capacity.use
 
         val multiplier = other.ptype.foldLeft(1.0)(_ * capacity.ctype.typeEfficiency(_).factor)
 
@@ -37,7 +37,7 @@ trait Pokemon(
 
         other.decreaseLife(Math.round(damage.toFloat))
 
-    def decreaseLife(x: Int) = this._life = this.life - x
+    def decreaseLife(x: Int): Unit = this._life = this.life - x
 
     override def toString(): String =
         s"[${this.name}] Life: ${this.life}\nMaxLife: ${this.maxLife}\nAttack: ${this.attack}\nDefense: ${this.defense}\nSpeed: ${this.speed}\n"

src/main/scala/backend/Pokemon/Trainer.scala

+class Trainer(val name: String, var listPokemon: List[Pokemon], var indexPrimaryPokemon: Int):
+
+    def getNumberPokemon: Int =
+        this.listPokemon.length
+
+    def getPrimaryPokemon: Option[Pokemon] =
+        this.listPokemon.lift(this.indexPrimaryPokemon)
+
+    def changePrimaryPokemon(index: Int): Unit =
+        assert(0 <= index && index < this.getNumberPokemon)
+        this.indexPrimaryPokemon = index