How to Declare Variables in Java

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In Brief...

To reference a variable in a Java program, you must first declare it. To declare a variable, follow these four steps.

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  1. Open your text editor and create a new file. Type in the following Java statements:
    Java Source for Declare VariablesTwo variables are declared. The first variable is of type int. A value is established in a separate Java statement. The second variable is of type String and is declared with an initial value.

  2. Save your file as

  3. Open a command prompt and navigate to the directory containing your new Java program. Then type in the command to compile your program and hit Enter.
    Compile Program with Variable Declarations

  4. Now run your Java program. Type in the command to run the Java runtime launcher and hit Enter. Notice the value of your variables in the program's output.
    Run Program with Variable Declarations

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Author: Stephen Withrow

Stephen has over 30 years' experience in training, development, and consulting in a variety of technology areas including Java, C, C++, XML, JavaScript, AJAX, Tomcat, JBoss, Oracle, and DB2. His background includes design and implementation of business solutions on client/server, Web, and enterprise platforms. Stephen is a published writer in both technical and non-technical endeavors. Stephen received an undergraduate degree in Computer Science and Physics from Florida State University.