{"id":17169,"date":"2018-06-02T04:00:26","date_gmt":"2018-06-02T04:00:26","guid":{"rendered":"https:\/\/data-flair.training\/blogs\/?p=17169"},"modified":"2021-12-04T10:15:37","modified_gmt":"2021-12-04T04:45:37","slug":"scala-inheritance","status":"publish","type":"post","link":"https:\/\/data-flair.training\/blogs\/scala-inheritance\/","title":{"rendered":"Scala Inheritance – Syntax, Example & Types of Inheritance in Scala"},"content":{"rendered":"

In our last Scala Tutorial<\/strong><\/a>, we discuss\u00a0Scala Case Class<\/a><\/strong>. Now, we\u00a0will discuss Scala inheritance with syntax and examples. Along with this, we will cover different types of inheritance in Scala Programming. At last, we will see examples of multilevel inheritance and\u00a0Hierarchical Inheritance\u00a0in Scala.<\/p>\n

Scala Inheritance – Syntax, Example & Types of Inheritance in Scala<\/p>\n

Scala Inheritance<\/h3>\n

When a class inherits from another, it means it extends another. We use the \u2018extends\u2019 keyword for this. This lets a class inherit members from the one it extends and lets us reuse code.
\nLet’s Learn Scala Map with Examples Quickly & Effectively<\/a><\/strong>
\nThe class that extends is the subclass, the child class, or the derived class. The other class is the superclass, the parent class, or the base class.<\/p>\n

\"Scala<\/a>

Scala Inheritance<\/p><\/div>\n

It is an IS-A relationship. You can also call it a generalization. A Student is a Person.<\/p>\n

A syntax of Scala Inheritance<\/h3>\n

To carry out Scala inheritance, we use the keyword \u2018extends\u2019:<\/p>\n

class Student extends Person(){\r\n\/*your code\r\n*goes here\r\n*\/\r\n<\/pre>\n
Let’s Discuss Scala String Interpolation – s String, f String and raw string Interpolator<\/a><\/strong><\/p>\n
Scala Inheritance Example<\/h3>\n
Let\u2019s take an example of Inheritance.<\/p>\n
scala> class Person{\r\n| var SSN:String=\"999-32-7869\"\r\n| }\r\ndefined class Person\r\nscala> class Student extends Person{\r\n| var enrolment_no:String=\"0812CS141028\"\r\n| println(\"SSN: \"+SSN)\r\n| println(\"Enrolment Number: \"+enrolment_no)\r\n| }\r\ndefined class Student\r\nscala> new Student()\r\nSSN: 999-32-7869\r\nEnrolment Number: 0812CS141028\r\nres0: Student = Student@42cfd794<\/pre>\n
In this example, we have two classes- Person and Student. We make Student extend Person. This means a Student is a Person.
\nSince Student extends Person, it inherits the attribute holding the social security number. In class Student, we print SSN and enrolment_no. Finally, we create an object of class Student.<\/p>\n
Types of Inheritance in Scala<\/h3>\n
Scala supports five kinds of inheritance:<\/p>\n
\"Scala<\/a>
Types of Inheritance in Scala<\/p><\/div>\n
a. Single-level Inheritance in Scala<\/h4>\n
Scala Single-level inheritance is when one class inherits from a single other class.<\/p>\n
\"Scala<\/a>
Single-level Inheritance<\/p><\/div>\n
Read about Scala Access Modifiers: Public, Private and Protected Members<\/a><\/strong><\/p>\n
b. Multilevel Inheritance\u00a0in Scala<\/h4>\n
When one class extends another, which in turn extends another, it is an instance of multilevel inheritance.<\/p>\n
\"Scala<\/a>
Multilevel Inheritance\u00a0in Scala<\/p><\/div>\n
Let’s Scala if-else Statements with\u00a0examples<\/a><\/strong><\/p>\n
c. Multiple Inheritance\u00a0in Scala<\/h4>\n
When one class inherits from multiple base classes, it is a case of multiple inheritances.<\/p>\n
\"Scala<\/a>
Multiple Inheritance\u00a0in Scala<\/p><\/div>\n
d. Hierarchical Inheritance\u00a0in Scala<\/h4>\n
When more than one class inherits from one base class, it is said to be hierarchical inheritance.<\/p>\n
\"Scala<\/a>
Multiple Inheritance in\u00a0Scala<\/p><\/div>\n
e. Hybrid\u00a0Inheritance\u00a0in Scala<\/h4>\n
Scala Hybrid inheritance is a combination of at least two kinds of inheritance.<\/p>\n
\"Scala<\/a>
Hybrid\u00a0Inheritance\u00a0in Scala<\/p><\/div>\n
Let’s explore Scala Operator in detail<\/a><\/strong><\/p>\n
Multilevel Inheritance Example – 1<\/h3>\n
scala> class A{\r\n| println(\"A\")\r\n| }\r\ndefined class A\r\nscala> class B extends A{\r\n| println(\"B\")\r\n| }\r\ndefined class B\r\nscala> class C extends B{\r\n| println(\"C\")\r\n| }\r\ndefined class C\r\nscala> new C()\r\nA\r\nB\r\nC\r\nres1: C = C@347f8029<\/pre>\n
In this example, we observe that class C extends class B and class B extends A.<\/p>\n
Example – 2<\/h3>\n
Take a look at this code:<\/p>\n
object Multiple{\r\n        def main(args: Array[String]):Unit={\r\n           trait A{\r\n                   var length:Int= _\r\n                   def action={\r\n                     length=length+5\r\n                  }\r\n             }\r\n           trait B{\r\n                   var height:Int = _\r\n                   def action={\r\n                     height = height + 1\r\n                  }\r\n             }\r\n           class C extends A with B{\r\n                   length=3;\r\n                   height+=6;\r\n                   override def action={\r\n                            super[A].action\r\n                            super[B].action\r\n                   }\r\n              }\r\n                var c=new C\r\n                c.action\r\n                println(c.height)\r\n                println(c.length)\r\n             }\r\n}<\/pre>\n
Here, we make use of traits to let class C inherit from traits A and B.<\/p>\n
Example- Hierarchical Inheritance<\/h3>\n
scala> class A{\r\n| println(\"A\")\r\n| }\r\ndefined class A\r\nscala> class B extends A{\r\n| println(\"B\")\r\n| }\r\ndefined class B\r\nscala> class C extends A{\r\n| println(\"C\")\r\n| }\r\ndefined class C\r\nscala> new B()\r\nA\r\nB\r\nres2: B = B@64c1a76e\r\nscala> new C()\r\nA\r\nC\r\nres3: C = C@193f5509<\/pre>\n
In this example, classes B and C inherit from class A.
\nDo you know Scala Job Opportunities: Profile, Salary & Top Organizations<\/a><\/strong><\/p>\n
Conclusion<\/h3>\n
Hence, we studied what is Inheritance in Scala with example and syntax. In addition, we saw different types of inheritance. If you have a doubt, feel free to ask in the comment section.
\nRelated Topic-\u00a0Scala Closures with Examples\u00a0<\/a><\/strong>
\nFor reference<\/a><\/strong>
In our last Scala Tutorial, we discuss\u00a0Scala Case Class. Now, we\u00a0will discuss Scala inheritance with syntax and examples. Along with this, we will cover different types of inheritance in Scala Programming. 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