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Qustion No. 1
Given the code fragment: public static void main(String[] args) Path dir = Paths.get("d:\\\\company");
// insert code here. Line **
for (Path entry: stream) {
System.out.println(entry.getFileName());
} catch (IOException e)
System.err.println("Caught IOException: " + e.getMessage());
}
Which two try statements, when inserted at line 11, enable you to print files with the extensions.java, .htm, end and .jar.
A. try (DirectoryStream<path> stream = Files.newDirectoryStream(dir, "*.java, htm, jar"))
B. try (DirectoryStream<path> stream = Files.newDirectoryStream(dir, "*.[java, htm, jar"]}
C. try (DirectoryStream<path> stream = Files.newDirectoryStream(dir, "*.
{java*, htm*, jar*"}} {D. try (DirectoryStream<path> stream = Files.newDirectoryStream(dir, "**.java, htm, jar"))
Answer: A,D
Reference: The Java Tutorials Finding Files What Is a Glob?
Qustion No. 2
Given a language code of fr and a country code of FR, while file name represents a resource bundle file name that is not the default?
A. MessageBundle_fr_FR.properties
B. MessageBundle_fr_FR.Profile
C. MessageBundle_fr_FR.Xml
D. MessageBundle_fr_FR.Java
E. MessageBundle_fr_FR.locale
Answer: A
Explanation: A properties file is a simple text file. You can create and maintain a properties file with just about any text editor. You should always create a default properties file. The name of this file begins with the base name of your ResourceBundle and ends with the .properties suffix. To support an additional Locale, your localizers will create a new properties file that contains the translated values. No changes to your source code are required, because your program references the keys, not the values.
For example, to add support for the German language, your localizers would translate the values in LabelsBundle.properties and place them in a file named LabelsBundle_de.properties. Notice that the name of this file, like that of the default file, begins with the base name LabelsBundle and ends with the .properties suffix.
Reference: The Java Tutorials, Backing a ResourceBundle with Properties Files
Qustion No. 3
What statement is true about thread starvation?
A. Thread "A" is said to be starved when it is frequently unable to gain access to a resource that it shares with another thread.
B. Thread "A" is said to be starved when it is blocked waiting for Thread "13," which in turn waiting for Thread "A."
C. Starvation can occur when threads become so busy responding to other threads that they move forward with their other work.
D. When some of the processors in a multi-processor environment go offline and the live thread(s) blocked waiting for CPU cycles, that blocking is referred to as "thread starvation."
Answer: A
Explanation: Starvation describes a situation where a thread is unable to gain regular access to shared resources and is unable to make progress. This happens when shared resources are made unavailable for long periods by "greedy" threads. For example, suppose an object provides a synchronized method that often takes a long time to return. If one thread invokes this method frequently, other threads that also need frequent synchronized access to the same object will often be blocked.
Reference: The Java Tutorials, Starvation and Livelock
Qustion No. 4
Which two statements are true about the walkFileTree method of the files class?
A. The file tree traversal is breadth-first with the given FileVisitor invoked for each file encountered.
B. If the file is a directory, and if that directory could not be opened, the postVisitFileFailed method is invoked with the I/O exception.
C. The maxDepth parameter’s value is the maximum number of directories to visit.
D. By default, symbolic links are not automatically followed by the method.
Answer: C,D
Explanation: C: The method walkFileTree(Path start, Set<FileVisitOption> options, int maxDepth, FileVisitor<? super Path> visitor) walks a file tree. The maxDepth parameter is the maximum number of levels of directories to visit. A value of 0 means that only the starting file is visited, unless denied by the security manager. A value of MAX_VALUE may be used to indicate that all levels should be visited. The visitFile method is invoked for all files, including directories, encountered at maxDepth, unless the basic file attributes cannot be read, in which case the visitFileFailed method is invoked.
D: You need to decide whether you want symbolic links to be followed. If you are deleting files, for example, following symbolic links might not be advisable. If you are copying a file tree, you might want to allow it. By default, walkFileTree does not follow symbolic links.
Reference: The Java Tutorials, Walking the File Tree
Reference: walkFileTree
Qustion No. 5
Given the fragment:
public class CustomerApplication {
public static void main (String [] args) {
CustomerDAO custDao = new CustomerDAOMemoryImp1 ();
// . . . other methods
}
Which two valid alternatives to line 3 would decouple this application from a specific implementation of customerDAO?
A. CustomerDAO custDao = new customerDAO();
B. CustomerDAO custDao = (CustomerDAO) new object();
C. CustomerDAO custDao = CustomerDAO.getInstance();
D. CustomerDAO custDao = (CustomerDAO) new CustomerDAOmemoryImp1();
E. CustomerDAO custDao = CustomerDAOFactory.getInstance();
Answer: C,E
Explanation:
Note: Data Access Layer has proven good in separate business logic layer and persistent layer. The DAO design pattern completely hides the data access implementation from its clients. The interfaces given to client does not changes when the underlying data source mechanism changes. this is the capability which allows the DAO to adopt different access scheme without affecting to business logic or its clients. generally it acts as a adapter between its components and database. The DAO design pattern consists of some factory classes, DAO interfaces and some DAO classes to implement those interfaces.
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