By David Parsons
This booklet offers a consultant to the middle good points of Java – and a few newer options – allowing the reader to construct abilities and self assurance notwithstanding tried-and-trusted phases, supported by means of routines that strengthen key studying issues. all the most precious and typically utilized Java syntax and libraries are brought, in addition to many instance courses that may give you the foundation for extra sizeable purposes. Use of the Eclipse IDE and the JUnit trying out framework is necessary to the booklet, making sure greatest productiveness and code caliber, even though to make sure that abilities will not be restricted to at least one atmosphere the basics of the Java compiler and run time also are defined. also, insurance of the Ant instrument will equip the reader with the abilities to instantly construct, try and installation purposes autonomous of an IDE. positive factors: provides info on Java 7; comprises various code examples and routines; offers resource code, self-test questions and PowerPoint slides at an linked website.
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Once your file is correct, complete, and saved, it can be run. To run a class with a main method, right-click on the class in the Package Explorer window, and then select “Run As” -> “Java Application” from the pop-up menu. Alternatively, you can use the green “run” button on the toolbar at the top of the IDE, which will run whichever class is currently at the front of the editing window (not likely to cause any confusion at the moment when we only have one class being edited). 11 shows the output from the program displayed in a new “Console” tab that will appear at the bottom of the screen.
By default, the classpath is the current directory, which is why our example program ran without us being aware of the classpath. The JVM was able to find the required class file in the current folder. However, we cannot always work with everything in one folder, so we need to understand how the classpath works. Since the classpath is closely linked to Java packages, we also need to understand what packages are for and how they work. 1 2 Compiling and Running Java Programs Packages All Java classes are placed in a package, even if it is the default (unnamed) package.
As long as we are working within a single folder, the classpath will not cause us any problems. If you are using a different Java compiler or runtime, then the detail of the process may be a little different, but the same things are happening, namely, that the source file is compiled into a class file that is then run on the virtual machine. When run, the program displays the following on the screen: My Java program running! Control then returns to the command prompt from which the application was run.