What is a Java comment?

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Java Comments. The Java comments are the statements that are not executed by the compiler and interpreter. The comments can be used to provide information or explanation about the variable, method, class or any statement. It can also be used to hide program code.

Moreover, how do you comment out a Java program?

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. 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).

Similarly, what is /* in Java? So, for the Java programming language, both /* */ and /** */ are instances of traditional comments, and they are both treated exactly the same by the Java compiler, i.e., they are ignored (or more correctly: they are treated as white space). However, as a Java programmer, you do not only use a Java compiler.

Just so, what are the types of comments in Java?

There are 3 types of comments in java.

  • Single Line Comment.
  • Multi Line Comment.
  • Documentation Comment.

How do you write a good Javadoc comment?

Javadoc coding standards

  1. Write Javadoc to be read as source code.
  2. Public and protected.
  3. Use the standard style for the Javadoc comment.
  4. Use simple HTML tags, not valid XHTML.
  5. Use a single <p> tag between paragraphs.
  6. Use a single <li> tag for items in a list.
  7. Define a punchy first sentence.
  8. Use "this" to refer to an instance of the class.

36 Related Question Answers Found

What is a nested comment?

Nested Comments
A single line comment can also be written within a block of code. This is called nesting. Nesting is when a comment or an additional block of code is placed inside of another block of code. The compiler will skip over the comment and continue to process the lines of code that follows.

What is a block comment?

Block comments delimit a region of source code which may span multiple lines or a part of a single line. This region is specified with a start delimiter and an end delimiter. Some programming languages (such as MATLAB) allow block comments to be recursively nested inside one another, but others (such as Java) do not.

What is single line comment?

Single-line comments allow narrative on only one line at a time. Single-line comments can begin in any column of a given line and end at a new line or carriage return. The // character sequence marks the text following it as a single-line comment.

What is a block comment in Java?

Multi-line comments or slash-star comments are called block comments. Java's block comments are used when more than one line of comments are written. Javadoc comments or documentation comments are inserted to describe classes, interfaces, fields, methods, or constructors.

What are the types of comments?

Seven types of comments emerge: directive, evaluative, advisory, interpretive, descriptive, directive questions (Socratic), and open-ended questions (discovery). The comments of beginners tended to be directive, evaluative, and/or advisory.

How do you comment code?

How to comment Code: Primarily, a single "block" comment should be placed at the top of the function (or file) and describe the purpose the code and any algorithms used to accomplish the goal. In-line comments should be used sparingly, only where the code is not "self-documenting".

How do you comment out a whole section in Java?

For single line comment you can use Ctrl + / and for multiple line comment you can use Ctrl + Shift + / after selecting the lines you want to comment in java editor. On Mac/OS X you can use Cmd + / to comment out single lines or selected blocks.

Can comments be longer than one line?

Single-line comments (informally, C++ style), start with // and continue until the end of the line. If the last character in a comment line is a the comment will continue in the next line. Multi-line comments (informally, C style), start with /* and end with */ .

What is the purpose of comments in Java?

Java Comments. The Java comments are the statements that are not executed by the compiler and interpreter. The comments can be used to provide information or explanation about the variable, method, class or any statement. It can also be used to hide program code.

What is data type in Java?

Data type specifies the size and type of values that can be stored in an identifier. The Java language is rich in its data types. Data types in Java are classified into two types: Primitive—which include Integer, Character, Boolean, and Floating Point. Non-primitive—which include Classes, Interfaces, and Arrays.

What is keyword in Java?

In Java, a keyword is a word with a predefined meaning in Java programming language syntax. Reserved for Java, keywords may not be used as identifiers for naming variables, classes, methods or other entities.

What is a class in Java?

Classes and Objects in Java. Classes and Objects are basic concepts of Object Oriented Programming which revolve around the real life entities. Class. A class is a user defined blueprint or prototype from which objects are created. It represents the set of properties or methods that are common to all objects of one

What are the 8 primitive data types in Java?

Primitive types are the most basic data types available within the Java language. There are 8: boolean , byte , char , short , int , long , float and double . These types serve as the building blocks of data manipulation in Java. Such types serve only one purpose — containing pure, simple values of a kind.

What is a Java package and how is it used?

Package in Java is a mechanism to encapsulate a group of classes, sub packages and interfaces. Packages are used for: Making searching/locating and usage of classes, interfaces, enumerations and annotations easier. Providing controlled access: protected and default have package level access control.

What are valid identifiers in Java?

A: In Java, all identifiers must begin with a letter, an underscore, or a Unicode currency character. Any other symbol, such as a number, is not valid. In Java an identifier is anything used for the name of a declared entity. So an identifier includes all package, class, method, parameter, and variable names.

What is an identifier in Java?

Identifiers in Java. Identifiers are the names of variables, methods, classes, packages and interfaces. Unlike literals they are not the things themselves, just ways of referring to them. In the HelloWorld program, HelloWorld , String , args , main and println are identifiers.

What is variable in Java?

A Java variable is a piece of memory that can contain a data value. A variable thus has a data type. Data types are covered in more detail in the text on Java data types. Variables are typically used to store information which your Java program needs to do its job.