Hi there, welcome to the practical session for Java programming here to learn by writing and compiling code. To gain hands on experience in Java. We'll begin by with a simple program, we will be finding different classes and defining main method and the main method will be writing functions and everything out. You could write this code on your own PC and save it with a dot java file format. And you could execute in the either in an IDE like NetBeans, Eclipse and mode or you can execute it directly. If your computer has a GDK already installed on your system, it could compile from the command line interface.

If you're on Windows, if you're on Linux, you could run in the terminal. As I'm using the online compiler, you could use online compiler from any system both Windows, Linux and Ruby as in In the same manner, I was in the coding round on here you can use or just simply write write your own simple program. Just begin by writing the public class method name, public class, here we are defining a class name called first x. For first experiment or first exercise, it will be followed using the camel case character, the first character is capital. And the first character of next word would be capital. Then we need to write public static void Main.

In the main function, I string args arguments and provided in the parent parenthesis right everything is this is the main block it will be executed whenever you try to execute this command or this code. The main method will call other methods or classes when required Here we'll declare three different variables of type integer, A, B and C, where a and b have a predefined values to entry here and C does not have a predefined value. Then we are going to display a message on the screen welcome on we have to enclose it in double quotes in order to display it on the screen, System dot out dot print ln reformat of writing this we can use to result of any arithmetic logical operations, image different variables, here we can perform addition, we are adding the values of EMP and restoring the result in the third variable C. Similarly, you could perform subtraction, multiplication, division and more operation.

Then, after we have stored the value, we would like to display it on the screen. Hit the Execute button and it will be executed on the screen. So we'll be writing the same command automatically. When you're writing on the windows command line or Linux terminal, you need to write this code, Java C, execute the file and then write Java and the message is displayed on this screen. We can perform different operations like changing the name of the variable. We can also define multiple variables on the same line.

We don't need to define it each time, we simply need to add a common delimiter here and separate the values value. Similarly, we could perform subtraction division or more operations. When we want to display multiple arguments, using print ln statement, we need to differentiate them or separate them using a plus delimiter. The plus would not print a sum yeah But Robert would display the values of values two times. When we write C plus two in C plus C. On the print statement, it will display the value of c two times we want to place space we need to add a space. In the print statement.

If we omit this print ln, ln line, it will be displayed on the same line. Actually, when we write to print ln, they align a new language we added after a string is displayed on the screen. So we need to remove the ln statement on the first string in order to have all the string in the same line. So it works. If you want to display a message on the same line, you could use the printf statement rather than using print ln to print ln would be more helpful is space efficient What happens when we don't cry public in the class method that we are unable to call this right. So, if it is in a public domain, it is visible to the compiler.

So, we need to write the class name as the public the main class not every class need to complete it is executed. Then we can change the data type here we could change from a from integer to double to care to float or more. So, the value result of resultant is changed to dot zero, because it will read decimal values it will double or float. Similarly, if we change the value of two the float of the variable and the resultant is still in integer. It could not be stored because float is four bytes on digit is of two bytes. So we could not install four byte data into two two byte.

However, we can do the reverse. So we need to make both of them either float or integer. The resultant variable c must be in a higher order variable data type and it is displayed on the screen and I said is this thing as well