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Running a Java Program
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Once you ve successfully compiled your Java program, it s time to run it Type the following line at the command prompt and press ENTER:
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java HelloWorld
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You should see Hello world! displayed on the screen in the Command Prompt window If you don t see it, one of two common problems has occurred:
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'java' is not recognized as an internal or external command, operable
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program or batch file If you see this message, your computer cannot find the java class loader Make sure that the Java Virtual Machine is installed on your computer If it s not, download the Java Virtual Machine for you computer from javasuncom Exception in thread "main" javalangNoClassDefFoundError: You probably entered HelloWorldjava or HelloWorldclass instead of HelloWorld when trying to run your program Don t include the file extension when running your Java program
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CHAPTER 1 Inside Java
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Now that you ve compiled and run your first Java program, let s take a closer look at it to see how the HelloWorld program works There are three parts to this program: the class definition, the method definition, and a statement
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Class Definition
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The class definition in the HelloWorld program contains all the pieces of the program necessary to display Hello world! on the screen The class definition, shown in Figure 1-2, consists of the following:
The class keyword The class name The class body
The keyword class informs the compiler that you are defining a class The keyword class must be followed by the name of the class In this example, HelloWorld is the class name The class name in the HelloWorld program must be the same as the program s filename Both names must match exactly; otherwise, you ll receive a compiler error when you compile the program Notice that the name of this class is made up of two words: Hello and World Java doesn t permit you to use spaces in a class name; however, it is a good idea to capitalize the first letter of each word used in the class name This makes it easier for you and other programmers to read The class body is where attributes are declared and methods defined The class body begins with a left brace ({), called an open brace, and ends with a right brace (}), called a close brace
Class keyword Class name Open brace
Class body
Close brace
Figure 1-2
The class definition must have these components
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Method Definition
Previously in this chapter you learned that a class has two elements These are attributes and behaviors, which are called methods An attribute is data that is associated with the class, and a method is a functionality of the class An attribute isn t a required part of a class, but every Java application must define one method the main() method The main() method, shown in Figure 1-3, is where the Java program begins A method definition consists of the following items:
Method name Method argument Method body Method return value
The method name is used to identify the method and to call the method whenever you need the program to perform the functionality provided by the method You ll learn all about methods in 5 For now, simply understand that the Java Virtual Machine calls the main() method when the program runs The method argument is the data identified between the parentheses to the right of the method name and is used by the method to provide the necessary functionality The main() method in the HelloWorld program has one method argument: String args[] You ll learn about this argument in 5 For now, we ll hold off discussing it because the HelloWorld program doesn t use it The method body is where you place statements that instruct the computer to perform specific functionality A pair of braces similar to the class body defines the method body Statements contained in a method body are executed sequentially The program terminates when the last statement in the main() method executes
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