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Introduction to Java programming

Computer program as we learned in the posting Introduction to Programming is a set of instructions that guide a computer to execute a particular task. It is synonymous to a recipe in a cook book. In which case the recipe has a list of ingredients called the data or variables, and a list of steps that tells the computer what to do with the data. Thus in short, programming is the technique of making a computer to perform something you want it to do. Programming or coding as it is commonly known in the programming world is the act of giving such instructions (usually in a high-level language) to a computer, which are then translated into binary language (0s and 1s) that a computer can understand.

Java programming the introduction

Java is a high-level programming language, part of what is commonly known as object-oriented programming languages. The notion to this is that every problem you try to solve is depicted as an object, thus solving the problems of any object by changing the attributes and behavior of such an object. Thus a normal java source code file will have a class definition, within that class we define the attributes of its objects by means of variables, we also define methods in which the behavior of the objects is coded. Once we are done, we can define an object of the class, outside of the class definition and that object can be used to call methods of the class and set its properties.

Bellow is an example of a Java class definition:

import java.io.*;

class HelloWorld{

private int counter = 0;



  public void displayContent(int moveby){



    this.counter += moveby;

    System.out.println("Moved position to" + this.counter);

  }

}



//usage:

HelloWord word = new HelloWorld();

word.displayContent(5);  // displays : Moved position to 5 if 
starting point was 0 before the call

Note that every statement in Java ends with a semicolon (;) and the class definition starts with class (small letters) with the class name starting with Capital letters. It is also considered good naming convention for variables and methods to start with small letters.

In the next few posting we will take a look at advanced java programming.

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Introduction to Java programming

Java programming the introduction

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