66 lines
2.2 KiB
Markdown
66 lines
2.2 KiB
Markdown
---
|
|
title: Comments in Java
|
|
---
|
|
## Comments in Java
|
|
|
|
Comments in java are like real life post-it notes used to display some information, which other programmers or developers can read and understand.
|
|
|
|
It is good practice to add comments to your code, especially when working with a team or at a company. This helps future developers or teammates to know what is going on more easily when they look at your code. Comments make your code more neat and organized.
|
|
|
|
Java comments are not executed by compiler and interpreter.
|
|
|
|
|
|
### Types of Java Comments
|
|
|
|
#### 1. Single Line Comment
|
|
|
|
To create a single line comment just add two `//` forward slashes before the text.
|
|
|
|
```java
|
|
// This is how single line comment looks like
|
|
```
|
|
|
|
In some editors you can comment out multiple lines or a large portion of code with single line comments by selecting the code, holding the `command` key, and then pressing the `/` forward slash key.
|
|
|
|
#### 2. Multi Line Comment
|
|
|
|
To Create a Multi line comment wrap the lines in between `/*` line goes here `*/`
|
|
|
|
```java
|
|
public class MyFirstJava {
|
|
public static void main(String[] args) {
|
|
/* This Java Code
|
|
Prints out "Hello world"
|
|
and you are looking at a multi line comment
|
|
*/
|
|
System.out.println("Hello World");
|
|
}
|
|
}
|
|
```
|
|
|
|
#### 3. Documentation Comment
|
|
|
|
Documentation comment is used by Javadoc tool to create documentation for the code. Documentation Comment is used by developers to document code, like what a class does or what a method does. This is used by a javadoc tool which will compile a preformatted set of html files containing all the information available in the comment.
|
|
```java
|
|
/**
|
|
* The Following Java program displays a random between 0 - 50
|
|
* Most Developer dont document simple program like this
|
|
*
|
|
* @author Quincy Larson
|
|
* @version 1.0
|
|
*/
|
|
|
|
public class RandomNumbers{
|
|
public static void main(String[] args) {
|
|
int random = (int)(Math.random() * 50 + 1);
|
|
System.out.println("Hello World");
|
|
}
|
|
}
|
|
```
|
|
|
|
|
|
#### More Information:
|
|
* [Java Resources](http://guide.freecodecamp.org/java/resources/)
|
|
|
|
* [Compiled Javadoc Example](https://docs.oracle.com/javase/8/docs/api/)
|