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3 C . The Java Basic I/O API contains classes and interfaces for data streams, serialization, and the file system.
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A, B,and D are incorrect because internationalization (i18n), RMI, JDBC, JNDI, and the Collections Framework are not included in the Basic I/O API. 8. Which API provides a lightweight solution for GUI components A. AWT B. Abstract Window Toolkit C. Swing D. AWT and Swing Answer:
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3 T C. he Swing API provides a lightweight solution for GUI components, meaning that the Swing API s classes are built from pure Java code.
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A, B,and D are incorrect. AWT and the Abstract Window Toolkit are one and the same and provide a heavyweight solution for GUI components. 9. Consider the following illustration. What problem exists with the packaging You may wish to reference 9 for assistance with UML.
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com.scjaexam.backing_beans BeanA BeanB COM.SCJAEXAM.UTILS UtilityA UtilityB
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A. You can only have one class per package. B. Packages cannot have associations between them. C. ackage com.scjaexam.backing_beans fails to meet the appropriate packaging P naming conventions. D. Package OM.SCJAEXAM.UTILS fails to meet the appropriate packaging naming C conventions.
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3 C D. OM.SCJAEXAM.UTILS fails to meet the appropriate packaging naming conventions. Package names should be lowercase. Note that package names should also have an underscore between words; however, the words in scjaexam are joined in the URL, therefore excluding the underscore here is acceptable. The package name should read com.scjaexam.utils.
A, B,and C are incorrect. A is incorrect because being restricted to having one class in a package is ludicrous. There is no limit. B is incorrect because packages can and frequently do have associations with other packages. C is incorrect because com.scjaexam. backing_beans meets appropriate packaging naming conventions.
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10. Which usage represents a valid way of compiling a Java class A. java MainClass.class B. javac MainClass C. javac MainClass.source D. javac MainClass.java Answer:
3 D . The compiler is invoked by the javac command. When compiling a java class, you must include the filename, which houses the main classes including the .java extension.
A, B,and C are incorrect. A is incorrect because MainClass.class is bytecode that is already compiled. B is incorrect because MainClass is missing the .java extension. C is incorrect because MainClass.source is not a valid name for any type of Java file. 11. Which two command-line invocations of the Java interpreter return the version of the interpreter A. java -version B. java --version C. java -version ProgramName D. java ProgramName -version
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3 A and C. The -version flag should be used as the first argument. The application will return the appropriate strings to standard output with the version information and then immediately exit. The second argument is ignored.
and D are incorrect. B is incorrect because the version flag does not allow double dashes. B You may see double dashes for flags in utilities, especially those following the GNU license. However, the double dashes do not apply to the version flag of the Java interpreter. D is incorrect because the version flag must be used as the first argument or its functionality will be ignored. 12. Which two command-line usages appropriately identify the class path A. javac -cp /project/classes/ MainClass.java B. javac -sp /project/classes/ MainClass.java C. javac -classpath /project/classes/ MainClass.java D. javac -classpaths /project/classes/ MainClass.java Answer:
3 A and C. The option flag that is used to specify the classpath is -cp or -classpath. and D are incorrect because the option flags -sp and -classpaths are invalid. B
13. Which command-line usages appropriately set a system property value A. java -Dcom.scjaexam.propertyValue=003 MainClass B. java -d com.scjaexam.propertyValue=003 MainClass C. java -prop com.scjaexam.propertyValue=003 MainClass D. java -D:com.scjaexam.propertyValue=003 MainClass Answer:
3 A . The property setting is used with the interpreter, not the compiler. The property name must be sandwiched between the -D flag and the equal sign. The desired value should immediately follow the equal sign.
B, C, nd D are incorrect because -d, -prop, and -D: are invalid ways to designate a a system property.
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