By David Parsons
This ebook offers a advisor to the center beneficial properties of Java – and a few more moderen concepts – allowing the reader to construct abilities and self assurance notwithstanding tried-and-trusted levels, supported by way of routines that toughen key studying issues. the entire most valuable and in general utilized Java syntax and libraries are brought, in addition to many instance courses that could give you the foundation for extra significant purposes. Use of the Eclipse IDE and the JUnit trying out framework is necessary to the ebook, making sure greatest productiveness and code caliber, even though to make sure that abilities are usually not restrained to 1 surroundings the basics of the Java compiler and run time also are explained.
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Additional resources for Foundational Java: Key Elements and Practical Programming
You can see that the example above (“intValue”) uses Camel case. The only difference between Pascal case and Camel case is whether the first letter is in upperor lowercase. If a variable is being locally declared in a method (such as “main”), then it has to be specifically initialized. If you simply declare a variable without initializing it, you will only get a warning from the compiler. However, if you attempt to refer to an uninitialized variable in other parts of the code, you will get a compiler error.
Classes have a simple name, which is the name of the class itself, and a fully qualified name, which includes the package name. ” Note The actual folders do not have to be created in advance. The Java compiler can create these as required. It is only the compiled byte code that actually needs to be in the named folder; the source code can be anywhere. ” This is useful because it means that a class in one package can be distinct from another class that has the same class name but is in a different package.
Whichever way we choose to do it, packages must be defined in conjunction with the classpath to enable running Java programs to find the necessary classes at runtime. 6 Comment Syntax 19 When you set the classpath, it can have multiple entries, separated by semicolons. When setting the classpath from the command line, we can also refer to existing system classpath settings by including %classpath%, as we did with the “path” example earlier in this chapter. For example, we could set the classpath to include existing settings, “C:\code” and the current directory (indicated simply by a period), like this: set classpath=%classpath%;c:\code;.