By: aathishankaran in Java Tutorials on 2007-02-01
Now we will see atomic elements of java. Java programs are a collection of white space identifiers, comments, literals, operators, separators, and keywords. The operators are described in the next article
Java is a free-form language. This means that you do not need to follow any special indentation rules. For example, the Example program could have been written all on one line or in any other strange way you felt like typing it, as long as there was at least one whitespace character between each token that was not already delineated by an operator or separator. In java, whitespace is a space, tab, or new line.
Identifiers are used for class names, method names, and variable names. An identifier may be any descriptive sequence of uppercase and lowercase letters, numbers or the underscore and dollar sign characters. They must not begin with a number, lest they be confused with a numeric literal. Again, java is case-sensitive, so VALUE is a different identifier the Value.Some examples of valid identifiers are:
AvgTemp, count, a4, $test, this_is_ok
Invalid variable names include:
2count, high-temp, Not/ok
Using a literal representation of it creates a constant value in java. For example, here are some literals:
100, 98.6 'X' "This is a test"
Left to right, the first literal specifies an integer, the next is a floating-point value, the third is a character constant, and the last is a string. A literal can be used anywhere a value of its type is allowed.
As mentioned, there are three types of comments defined by java. You have already seen two: single-line and multilane. The third type is called a documentation comment. This type of comment is used to produce an HTML file that documents your program. The documentation comment begins with a
/** and ends with a*/
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
- Your name, rating, website address, town, country, state and comment will be publicly displayed if entered.
- Aside from the data entered into these form fields, other stored data about your comment will include:
- Your IP address (not displayed)
- The time/date of your submission (displayed)
- Your email address will not be shared. It is collected for only two reasons:
- Administrative purposes, should a need to contact you arise.
- To inform you of new comments, should you subscribe to receive notifications.
- A cookie may be set on your computer. This is used to remember your inputs. It will expire by itself.
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
- Although the administrator will attempt to moderate comments, it is impossible for every comment to have been moderated at any given time.
- You acknowledge that all comments express the views and opinions of the original author and not those of the administrator.
- You agree not to post any material which is knowingly false, obscene, hateful, threatening, harassing or invasive of a person's privacy.
- The administrator has the right to edit, move or remove any comment for any reason and without notice.
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Most Viewed Articles (in Java )
Latest Articles (in Java)
- Data Science
- React Native
- Cloud Computing
- Java Beans
- Mac OS X
- Office 365
- Tech Reviews