#2 First Code in Java
In this lecture we will learn:
Using the VsCode IDE
How to start VsCode?
How do we create a project?
Creating the first java code
Use of JShell to run small codes
Steps to compile a code in the terminal
#1
We will start doing coding in the VsCode.
VsCode includes Explorer, Search, Run and Debug, and Add Extension options in it.
You can add an extension if you want as per the VsCode recommendation like Extension Pack for Java.
We will create a project in Explorer.
VsCode itself has a terminal where you can run commands.
java --version - used to check the version of java
javac --version - used to check the version of java compiler
java command is used to run the code while the javac command is used to compile the code.
:- How do we create a project?
Project is a very broad term that is used when we create some files and merge these files with libraries.
We will create a new folder where we store all the files of our course.
:- Creating a first Java file:
-You can create the first java file in a folder like Hello.java.
.java is an extension of Java files.
#2
Creating our first Java Code to print "Hello World" :
JShell:-
We have a concept of JShell that is introduced in Java 9 where you can create small codes and perform operations.
Print is an inbuilt method in Java that is used to print anything and it uses with System.out like:
System.out.print(6);
System.out.print("hello world");
double quotes are used to print any text.
a semicolon is required after every statement in Java as per the syntax.
-JShell can't be used for doing projects, it is only useful for experiments or learning concepts.
Two steps to compile any code:
1. Compile the code using the javac command.
javac filename
2. Run the code using the java command.
java classname
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