How to code in Java for beginners.

Hello World, Escape sequence and comments in Java.










In the previous lesson, we talk about how to set-up your environment to start writing Java projects if you are trying it for the first time.

In this section, we are going to talk about the most basic concept in java. This are running your first code on the console, using escape sequence and how to write comments in java.

 

Running Your First Java Project

The most popular first Java code we all write as a developer is the Hello World! Code.

package com.techwithnate;



public class Main {

    public static void main(String[] args) {

        // This is a single line comment

        System.out.println("Hello World"); 
 
 }
}

NOTE: There is a short cut in typing System.out.println(); and this is sout + Tab or Enter key

Run

 Hello World

 

When using the “print” statement, It displays all statements on the same line but when using the “println” statement, it displays different output on different lines.

Escape Sequence.

It is used as a shortcut to perform specific tasks like adding a tab space, printing on a new line and other more. Let’s dive in a little of escape sequence.

1.       New Line escape sequence

System.out.print("Hello World\n");  
System.out.print("I love codding"); 
 

I love coding is printed on a new line.

 

Check out the escape sequence below and how they work.

System.out.print("Hello World\n");      // This is a next line escape sequence

System.out.println("\tI love Programming"); // This is tab escape sequence

System.out.println("\\I love coding in Java\\"); // This is to print backward slash '\'

System.out.println("\"Java is good\""); // This prints a double quotation ""

System.out.print("I love codding");

 

 

Output.

Hello World

                I love Programming

\I love coding in Java\

"Java is good"

 

 

COMMENTS IN JAVA

Comments Help to explain lines of codes and also enlightens other developers about the functionality of a certain line of code. Comments are not printed on the console, it is ignored by the interpreter.

There are two types of comments in java.

1.       Single line comment

2.       Multi line comment

 

 

package com.techwithnate;



public class Main {

    public static void main(String[] args) {

        // This is a single line comment

        



        /*

        This

        is

        a

        multi

        line

        comment

         */

    }

}





CONGRATULATIONS FOR ENDING UP YOUR FIRST BASIC LESSON IN JAVA

Next, we are going to talk about Variables and operators.