How do you comment a whole class in Java? if using an ide: one can do " ctrl + a ", and then do " ctrl + shift + / ", and that will comment out all of the code. In Eclipse you can use Ctrl+/ to toggle single-line comments on selected lines. If you're using another IDE you probably have something similar.
How do I add comments to a class in Java?
Place these comments directly above the method, class, constructor or any other Java element that you want to document. For example: * Make this a summary sentence describing your class. * Here's another line.
How do you write a single line comment in Java?
Single-line comments start with two forward slashes ( // ). Any text between // and the end of the line is ignored by Java (will not be executed). Multi-line comments start with /* and ends with */. Any text between /* and */ will be ignored by Java.
How many types of comments are there in Java?
There are three types of comments in Java. The single-line comment is used to comment only one line of the code. It is the widely used and easiest way of commenting the statements. Single line comments starts with two forward slashes (//). Any text in front of // is not executed by Java. Let's use single line comment in a Java program.
What is the role of comments in Java?
In Java, the role of comments is to make it more human readable. Comments can make finding errors in Java program easier. Here are different types of comments in Java: 1. Single-line Comments As the name suggests, these comments end in single line. They begin with two forward slashes (//). They can also be used to make in-line comments.
Java Comments
Comments can be used to explain Java code, and to make it more readable. It can also be used to prevent execution when testing alternative code.
Example
It is up to you which you want to use. Normally, we use // for short comments, and /* */ for longer.
Why do you put comments in Java?
It's good practice to get into the habit of putting Java comments into your source code to enhance its readability and clarity for yourself and other programmers. It isn't always instantly clear what a section of Java code is performing.
What is code comment?
Generally, code comments are "implementation" comments that explain the source code, such as descriptions of classes , interfaces, methods, and fields. These are usually a couple of lines written above or beside Java code to clarify what it does. Another type of Java comment is a Javadoc comment.
Do Java compilers care about comments?
Java compilers don't care about them and when compiling the program, they just skip over them. The size and efficiency of your compiled program will not be affected by the number of comments in your source code.
How to write comments in Java?
I wanted to close this tutorial with some best practices for writing Java comments: 1 Remember that comments are not subtitles and therefore, your comments shouldn't translate each line of code into human language. Said differently, comments are supposed to support the code so that when you or anybody comes back to it, they can make sense of it. Explaining the code in detail will only look silly and also make your code bulky. 2 Do not just repeat what you code is able to explain clearly. There are certain commands that are clear enough and do not need explanation. As an example, the following comment is unecessary:#N#System.out.println("Hello World!");#N#To reiterate, the above code is simple and clear. The comment in it is redundant and not required. 3 Smelly comments need to be avoided at all cost. When you try to explain a code in detail to make sure the reader is not confused, it's a signal that something is wrong with your code. No comment can fix that. 4 Write your comments as you go and do not make it a habit of going back and commenting after code completion. 5 Keep the comments short and precise. 6 When you place comments inline, make sure they are separated from the main code with at least two spaces.
What is a document comment?
Documentation Comments. Documentation comments are used when code is written for a project or a software package. Documentation comments help generate a documentation page for reference, which is useful in getting information about methods, parameters and more.
What is nesting in Java?
Nesting is a term that refers to placing of a comment or an additional block of code inside another block of code - which could be a function, a loop, or something else. The compiler will skip the comment and continue to process the rest of the code.
When to use multi line comments?
When a comment has to be longer than one line, multi-line comments are useful. Multi-line comments can also be created by putting ‘//’ at the beginning of each line, but that becomes quite tedious when comments are very long.
Do you comment when you write code?
Good programmers tend to comment as they go while writing the code. Most of the time, when you write code, you will need to go back and make changes later. Without Java comments, it's easy to get lost. This is why I specifically make sure to make comments as I write code.
