and remove garbage from your code. Just try (Make a web site)
and remove garbage from your code. Just try the following: set Parameter Is Never Read to Warning and press OK. The project is recompiled. At the program line public static void main(String[] args) { you now see a warning icon, and in the Problems window you see the entry The argument args is never read Quite right! The HelloWorld program did not make use of the parameter that contains the commandline arguments. Classfiles and JDK Compliance On the Compliance & Classfiles page you can specify which symbolic information, such as variable names and line numbers, is to be included in the generated classfiles. This information is required for debugging, and therefore you may want to leave the proposed settings unchanged. However, for a welltested program it may make sense to remove this information from the classfiles; generated files are much smaller without the symbol tables. On the same page you can determine whether the compiler must comply with the Java 1.4 or Java 1.3 syntax. With Java 1.4, one new instruction was added to the language: assert. Consequently, the word assert can no longer be used as a field or method name. In addition, assert requires support from the JVM. Classes that use this instruction cannot be executed by older JVMs. Since assert is not used in the first example program, leave this setting at the proposed value of Java 1.3. Formatting Code Formatting code can be very helpful, because it is easier to detect violations of the control structures of a program (such as open if or while statements) when the program is formatted. In the preference category Java > Code Style > Code Formatter you can configure how the Eclipse code formatter works, as shown in Figure 1.14. The best method is to try some of the settings and to select those that work best for your application. To modify these settings you must first create a new profile (by pressing the New button). Then you can edit this profile by pressing the Edit button. You can create multiple profiles and switch easily among them. When you publish your code, for example, you may use different profiles for different sorts of publications. But how do you apply code formatting? Very simply: just click with the right mouse button on the source code and select Source > Format from the context menu (Figure 1.14). The key shortcut Ctrl+Shift+F works even faster. Note that it is also possible to select only a portion of the source code to format just that portion. 15 Introduction to Eclipse
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