By Paul Whitehead Ernest Friedman-Hill Emily A. Vander Veer Friedman-Hill Vander Veer
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Additional resources for Java(tm) and XML: Your visual blueprint for creating Java-enhanced Web programs
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Type the name of the file. ‹ Click Save. ■ Use the same name as that ■ Notepad saves your code. java extension. Note: You can now compile the Java code. See the section "Compile a Java Program" for more information. F 5/24/02 8:59 AM Page 28 JAVA AND XML COMPILE A JAVA PROGRAM y compiling Java code you can convert previously saved source code in a text file into bytecode. Bytecode contains instructions that the Java interpreter executes. B You need a Java compiler to compile Java code. The Java SDK includes a Java compiler application called javac, which you can execute from the command prompt.
F 5/24/02 8:59 AM Page 36 JAVA AND XML SPECIFY THE DATA TYPE FOR A VARIABLE ava is a "strongly typed language," which means that you must specify a data type for each variable that you use in a Java program. This distinguishes Java from many other programming languages, such as Perl, which do not require you to assign variables to data types. J Variables can use eight basic data types, called primitive types. The data type you specify for a variable determines the range of values that the variable can store and the amount of memory, measured in bits, that the variable requires.
The access modifiers you use in method declaration determine the locations from which you can call the method. You can also group classes that contain methods into a package. You may need to specify the package in which the class containing the method is located. " In addition to calling methods you have created, you can also call methods that the Java class library provides. println() calls a Java class library method, which you can use to display data. For more information about the Java class library, see Chapter 2.