Basic Java Language: Difference between revisions

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You can't create two variables with the same identifier, all identifiers must be unique. You also can't use an identifier that is a Java keyword. Here is a list of all the [http://en.wikipedia.org/wiki/Java_keywords Java Keywords]. [[Flashcards for Java keywords]] provides some assistance in memorizing the concepts behind specific keywords.

=Comments=

- Comments are notes that the developer can insert into their code. This allows the developer to keep track of their code and helps when developers are collaborating on a project. It is good to write a summary of the following code at the beginning of your methods, classes, etc. The Java compiler completely ignores comments, so you can say anything in them

-

- Comments are written using two forward slashes

- <pre>//This is a comment</pre>

- Comments can be written at the end of a line

- <pre>System.out.println("I love comments"); //This is also a comment</pre>

- Comments can also be written on multiple lines by starting with '''/*''' and ending with'''*/'''.

- <pre>/* Comment 1

- Comment 2

- Comment 3 */</pre>

- :Sun recommends the above form be reserved for information intended for automatic JavaDoc documentation.

=Compiling and Running your program=

To compile your program, go to the directory you saved it. Note that if your class was named NaMe then your file '''must''' be named NaMe.java. Anyways, type: <code>javac NaMe.java</code> where NaMe is your class name. To run, type <code>java NaMe</code>.

@@ Line 165: / Line 165: @@
 You can't create two variables with the same identifier, all identifiers must be unique. You also can't use an identifier that is a Java keyword. Here is a list of all the [http://en.wikipedia.org/wiki/Java_keywords Java Keywords].  [[Flashcards for Java keywords]] provides some assistance in memorizing the concepts behind specific keywords.
+=Comments=
+- 	Comments are notes that the developer can insert into their code. This allows the developer to keep track of their code and helps when developers are collaborating on a project. It is good to write a summary of the following code at the beginning of your methods, classes, etc. The Java compiler completely ignores comments, so you can say anything in them
+-
+- 	Comments are written using two forward slashes
+- 	<pre>//This is a comment</pre>
+- 	Comments can be written at the end of a line
+- 	<pre>System.out.println("I love comments"); //This is also a comment</pre>
+- 	Comments can also be written on multiple lines by starting with '''/*''' and ending with'''*/'''.
+- 	<pre>/* Comment 1
+- 	Comment 2
+- 	Comment 3 */</pre>
+- 	:Sun recommends the above form be reserved for information intended for automatic JavaDoc documentation.
 =Compiling and Running your program=
 To compile your program, go to the directory you saved it. Note that if your class was named NaMe then your file '''must''' be named NaMe.java. Anyways, type: <code>javac NaMe.java</code> where NaMe is your class name. To run, type <code>java NaMe</code>.

Basic Java Language: Difference between revisions

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