Getting Started with Basic Java Constructors



Constructor :-

        In Java, a class instance is created using the constructor. With the exception of having no return type and having the same name as the class, constructors are nearly identical to methods. In java programming, constructor run first. 

              



        1. Parameterless Constructor

                     Parameter-less constructors are those that are defined without any arguments or parameters. The operation of a parameter-less constructor is similar to that of a default constructor; it might be empty or contain statements.



       1. Parameterized Constructor

                In Java programming, parameterized constructors are constructors that have one or more arguments and are written by programmers for a class. When creating user instances of objects with user-defined states, parameterized constructors come in handy. In classes, parameterized constructors can exist in several instances.













Comments

Post a Comment

Popular posts from this blog

අද අපි කතා කරමු Data collections ගැන

Image
 අද අපි කතා කරමු Data collections ගැන. Data Collections ගැන කතා කරන්න කලින් අපි කතා කරමු Data Arrays ගැන. Data Array එකක් කියන්නෙ එකම වර්ගයේ Data අනුපිළිවෙලකට ගබඩා කරන්න පුලුවන් දාත්ත ව්‍යූහයක්(Data Structure). Array එකේ Type එක String නම් ඒකෙ තියෙන්න පුලුවන් String Data විතරයි. Array එකක් නිර්මාණය කරද්දි ඒකට අදාලව Fixed Size එකක් දෙන්න ඕනි. Array එකක් හැදුවට පස්සෙ අපට Array එක වෙනස් කරන්න බෑ. ex:-  int[] array = new int[5];         array[0] = 1;                 array[1] = 2;                 array[2] = 3;                 array[3] = 4;                 array[4] = 5; එතකොට මොනාද මේ Array වල තියෙන ප්‍රශ්න?      මම මුලින් කිව්වා වගේ Array එකක් හදනකොට අපි ඒකට Fixed Size එකක් දෙන්න ඕනි. දැන් ඔයාලා හිතන්නකො අපි Size එක 5ක් වෙන Array එකක් හදනවා integer වලින්. එතකොට අපිට ඒ Array එකට ඇඩ් කර...
Read more

Understanding and Mastering Coding Errors

Image
 Understanding and Mastering Coding Errors      Coding errors are an inevitable part of the software development journey. Whether you're a novice programmer or a seasoned developer, encountering errors is something you can count on. But rather than seeing them as roadblocks, errors can be powerful learning tools that help you write better code.      There are 3 main types of errors.                     1.Syntax Errors 2.Logical Errors 3.Runtime Errors 1.Syntax Errors:-      Syntax errors occur when the code violates the rules of the programming language. These errors are usually detected by the compiler during the initial stages of program execution. Common examples include missing semicolons, mismatched parentheses, or misspelled keywords.               Above code, semicolon is missed. That is a syntax error. If there any syntax er...
Read more

OOP key points

Image
Key Points Of Object Oriented Programming (OOP) Object Oriented Programming:- It is a computer programming model based on object. We can use it in various programming languages to develop a program.  Building Blocks of OOP Object:-             Object can be define as data field that has unique attributes and behaviors.              Objects can correspond to real-world objects or an abstract entity.      2.Class:-              Class  is a sketch used to implement an object at the programming level.               And also we an define class as "A template that can keep the things what we need".   3.Method:-                A method in OOP is a block of code that, when called, performs specific actions mentioned in it.    4.Variable:- ...
Read more