Extending a Class in Scala

// Scala program of extending a class

// Base class 
class Geeks1
{ 
    var Name: String = "chaitanyashah"
} 

// Derived class 
// Using extends keyword 
class Geeks2 extends Geeks1
{ 
    var Article_no: Int = 30
    
    // Method 
    def details() 
    { 
        println("Author name: " + Name); 
        println("Total numbers of articles: " + Article_no); 
    } 
} 

// Creating object
object GFG 
{ 
    
    // Driver code 
    def main(args: Array[String]) 
    { 
        
        // Creating object of derived class 
        val ob = new Geeks2(); 
        ob.details(); 
    } 
} 

// Scala program of extending a class

// Base class
class Parent 
{ 
    var Name1: String = "geek1"
    var Name2: String = "geek2"
} 

// Derived from the parent class 
class Child1 extends Parent 
{ 
    var Age: Int = 32
    def details1() 
    { 
        println(" Name: " + Name1)
        println(" Age: "  + Age) 
    } 
} 

// Derived from Parent class 
class Child2 extends Parent 
{ 
    var Height: Int = 164
    
    // Method 
    def details2() 
    { 
        println(" Name: " + Name2) 
        println(" Height: " + Height) 
    } 
} 

// Creating object
object GFG 
{ 
    
    // Driver code 
    def main(args: Array[String]) 
    { 
        
        // Creating objects of both derived classes 
        val ob1 = new Child1(); 
        val ob2 = new Child2(); 
        ob1.details1(); 
        ob2.details2(); 
    } 
} 

// Scala program of extending a class

// Base class
class Bicycle (val gearVal:Int, val speedVal: Int)
{
    // the Bicycle class has two fields 
   var gear: Int = gearVal
   var speed: Int = speedVal
   
   // the Bicycle class has two methods 
   def applyBreak(decrement: Int)
   {
       gear = gear - decrement
       println("new gear value: " + gear);
   }
   def speedUp(increment: Int)
   {
       speed = speed + increment;
       println("new speed value: " + speed);
   }
}

// Derived class
class MountainBike(override val gearVal: Int, 
                    override val speedVal: Int,
                    val startHeightVal : Int) 
                    extends Bicycle(gearVal, speedVal)
{
    // the MountainBike subclass adds one more field 
   var startHeight: Int = startHeightVal
   
   // the MountainBike subclass adds one more method 
   def addHeight(newVal: Int)
   {
       startHeight = startHeight + newVal
       println("new startHeight : " + startHeight);
   }
}

// Creating object
object GFG 
{
    // Main method
    def main(args: Array[String]) 
    {
        val bike = new MountainBike(10, 20, 15);

        bike.addHeight(10);
        bike.speedUp(5);
        bike.applyBreak(5);
    }
}