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Data types and Literals in Java

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Data types Data types category:   Data types summary: Literals A constant value which can be assigned to variable is called "Literal". Integral Literals All possible value of Integral data type(byte, short, int and long) are called Integral Literals. Default Value: By default every Integral literal is int type. When you assign a value in long data byte and that value is more than 2147483647(Maximum value for int) then compiler will give you error. Ex: long a = 3000000000; Error: The literal 3000000000 of type int is out of range  Even though we have used long data type and value is also within range of long but still compiler gives error because every integral literal is int type. We can resolve this error by specifying long type explicitly. We can specify long type by suffixing l or L . Ex: long a = 3000000000L; Number System: Integral Literal can be represented as Decimal, Octal and Hexadecimal number systems. L...
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How to define Auxiliary Constructor in case class in Scala

We have seen case class previously. We had discussed what is case class, how to create object of case class, list of boilerplate code generated for case class. If you don't know case class, I recommend to understand case class first. Let us revise case class declaration. case class Person(id:Int, name: String) Person class is declared with primary constructor where id and name are parameter. So good so far. The constructor which is not primary constructor, other than primary constructors and overloaded to primary constructor are called auxiliary constructor. How will you declare Auxiliary(other overloaded) constructors. What is syntax of creating auxiliary constructor. Please note that constructors in case class are not really constructor. Actually these are apply methods on companion object. Auxiliary constructor in case class are different than regular class. We can add auxiliary constructors in case class by adding apply() methods in companion object of case class...
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Create your own LinkedList in Java

As a Java developer, we need to frequently use the collection framework. Have you ever tried to create your own any of the collection classes in Java? Here we go, we will see how to create our own LinkedList in Java. We will create a very simple class with add and get methods. Also, the LinkedList class of collection framework is doubly LinkedList but we will singly LinkedList. Line 36 to 42, we have created an inner class i.e Node with a generic type T. This class has 2 fields: item field is a generic type that will hold an actual value of LinkedList node. next field is a Node type that holds the address of the next node of the LinkedList. We have also defined a constructor to set value for the item field. In lines 4 and 5, we have created an instance variable of type Node in MyLinkedList class i.e. first and last. The field first will always hold the first node of the LinkedList and the field last will always hold the node of LinkedList. Now the question is, why...
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