Editing Java (programming language) (section)

== Syntax ==
{{Main|Java syntax}}
[[File:JavaUniverse.png|thumb|upright|This dependency graph of the Java Core classes was created with jdeps and [[Gephi]].]]
The syntax of Java is largely influenced by [[C++]] and [[C (programming language)|C]]. Unlike C++, which combines the syntax for structured, generic, and object-oriented programming, Java was built almost exclusively as an object-oriented language.<ref name="design_goals" /> All code is written inside classes, and every data item is an object, with the exception of the primitive data types, (i.e. integers, floating-point numbers, [[Boolean data type|boolean values]], and characters), which are not objects for performance reasons. Java reuses some popular aspects of C++ (such as the {{java|printf}} method).

Unlike C++, Java does not support [[operator overloading]]<ref name="msdn_operator_overloading">{{cite web |url=http://msdn.microsoft.com/en-us/library/ms228498%28v=vs.90%29.aspx |title=Operator Overloading (C# vs Java) |publisher=Microsoft |work=C# for Java Developers |access-date=December 10, 2014 |archive-url=https://web.archive.org/web/20150107190007/http://msdn.microsoft.com/en-us/library/ms228498(v=vs.90).aspx |archive-date=January 7, 2015 |url-status=live}}</ref> or [[multiple inheritance]] for classes, though multiple inheritance is supported for [[interface (Java)|interfaces]].<ref name="oracle_multiple_inheritance">{{cite web |url=https://docs.oracle.com/javase/tutorial/java/IandI/multipleinheritance.html |title=Multiple Inheritance of State, Implementation, and Type |publisher=Oracle |work=The Java Tutorials |access-date=December 10, 2014 |archive-url=https://web.archive.org/web/20141109034520/https://docs.oracle.com/javase/tutorial/java/IandI/multipleinheritance.html |archive-date=November 9, 2014 |url-status=live}}</ref>

Java uses [[Comment (computer programming)|comments]] similar to those of C++. There are three different styles of comments: a single line style marked with two slashes (<code>//</code>), a multiple line style opened with <code>/*</code> and closed with <code>*/</code>, and the [[Javadoc]] commenting style opened with <code>/**</code> and closed with <code>*/</code>. The Javadoc style of commenting allows the user to run the Javadoc executable to create documentation for the program and can be read by some [[integrated development environment]]s (IDEs) such as [[Eclipse (software)|Eclipse]] to allow developers to access documentation within the IDE.

=== Hello world ===
The following is a simple example of a [["Hello, World!" program]] that writes a message to the [[standard output]]:
<syntaxhighlight lang="java" line="1">public class Example {
    public static void main(String[] args) {
        System.out.println("Hello World!");
    }
}</syntaxhighlight>