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Coding I

In this course we will use the Java programming language. Java is a modern, high level, object oriented programming language, which supports also the imperative and the functional programming paradigms.


General characteristics of Java:

• simple
• platform independent (the same program can be run on Windows, Unix, MacOS, etc.)
• comes equipped with a very rich set of well developed libraries
• designed for the use on Internet
• based on virtual machine (see later)
• safe (the virtual machine forbids undesired accesses to applications running via the Internet)

 

      
import java.lang.*;
public class First 
{
  public static void main(String[] args) 
  {
     System.out.println("This is my first Java program.");
  }//end main
}//end class

The statements have the following meaning:
 import java.lang.*; 
  request to use libraries of predefined classes/programs 
(in fact, the java.lang library is imported automatically, hence this statement can be omitted) public class First {...} definition of a class/program called First public static void main(String[] args) {...} definition of the main method (a method is the realization of an operation in Java) System.out.println("This is my first Java program."); statement to print a message on the video System.out predefined object/instance of the predefined class PrintStream println method of the class PrintStream applied to the object System.out "This is my first Java program." object of the class String representing the sentence to display

 

 

 

 

Updated: Friday, July 24, 2020 5:18 PM

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