In this Java tutorial, we are going to learn about the basic syntax used in Java language. A syntax for any language is the set of rules by which. Java - Basic Program. Object - Objects have states and behaviors. Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support. Methods - A method is basically a behavior. Instance Variables - Each object has its unique set of instance variables. When we consider a Java program it can be defined as a collection of objects that communicate via invoking each other's methods. Let us now briefly look into what do class, object, methods and instance variables mean. In more deep it will be explained later. Objects have states and behaviors.


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Package Declaration The first line in the code example shown earlier is the package declaration. This part, to be more specific: Packages and package declarations are covered in more detail in the text on Java packages. Import Basic syntax of java The second line in the code example above is an import statement.

Java syntax - Wikipedia

To be more specific, this part: HashMap; This example only has a single import statement, but multiple import statements can be used, each on its own line. An import statement tells the Java compiler which other Java files this Java file is using. A Java file only needs to import Java files which are not located in the same Java package as the Java file.

Now, type ' java MyFirstJavaProgram ' to run your program. Basic syntax of java will be able to see ' Hello World ' printed on the window. Basic syntax of java several words are used to form a name of the class, each inner word's first letter should be in Upper Case.

Java Tutorial - Basic Syntax and Program, Simple Program, Java Simple example, First java program

If several words are used to form the name of the method, then each inner word's first letter should be in Upper Case. When saving the basic syntax of java, you should save it using the class name Remember Java is case sensitive and append '.


Assume 'MyFirstJavaProgram' is the class name. Then the file should be saved as 'MyFirstJavaProgram. Java Identifiers All Java components require names.

Java Basic Syntax

Names used for classes, variables, and methods are called identifiers. A keyword cannot be used as an identifier since it has reserved words and have some special meaning.

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Examples of illegal identifiers: Examples of legal identifiers: Whitespaces in Java A line containing only whitespace, possibly with comment, is known as blank line, and Java compiler totally ignores it. Save the basic syntax of java as: Open a command prompt window and go o the directory where you saved the class.

Type ' javac SimpleProgram.

If there are no errors in your code the command prompt will take you to the next line. The path variable is set. Now type ' java SimpleProgram' to run your program.

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