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QUESTION NO:97
Given the code fragment:
public void infected() {
System.out.print(“before “);
try {
int i = 1/0;
System.out.print(“try “);
} catch(Exception e) {
System.out.print(“catch “);
throw e;
} finally {
System.out.print(“finally “);
}
System.out.print(“after “);
}
What is the result when infected() is invoked?
A. before try catch finally after
B. before catch finally after
C. before catch after
D. before catch finally
E. before catch
Answer: C
Explanation: The following line throws and exception:
int i = 1/0;
This exception is caught by:
catch(Exception e) {
System.out.print(“catch “);
throw e;
Lastly, the finally statement is run as the finally block always executes when the try block
exits. This ensures that the finally block is executed even if an unexpected exception
occurs.
Reference: Java Tutorial, The finally Block
QUESTION NO:115
Select four examples that initialize a NumberFormat reference using a factory.
A. NumberFormat nf1 = new DecimalFormat();
B. NumberFormat nf2 = new DecimalFormat(“0.00”) ;
C. NumberFormat nf3 = NumberFormat.getInstance();
D. NumberFormat nf4 = NumberFormat.getIntegerInstance();
E. NumberFormat nf5 = DecimalFormat.getNumberInstance ();
F. NumberFormat nf6 = Number Format.getCurrecyInstance () ;
Answer: C,D,E,F
Explanation: getInstance
public static final NumberFormat getInstance()
Returns the default number format for the current default locale. The default format is one
of the styles provided by the other factory methods: getNumberInstance (E),
getIntegerInstance (D), getCurrencyInstance (F) or getPercentInstance. Exactly which one
is locale dependant.
C: To obtain a NumberFormat for a specific locale, including the default locale, call one of
NumberFormat\’s factory methods, such as getInstance().
E: To obtain standard formats for a given locale, use the factory methods on
NumberFormat such as getNumberInstance. These factories will return the most
appropriate sub-class of NumberFormat for a given locale.
F: To obtain standard formats for a given locale, use the factory methods on
NumberFormat such as getInstance or getCurrencyInstance.
Reference: java.text Class NumberFormat
QUESTION NO:14
Given the existing destination file, a source file only 1000 bytes long, and the code
fragment:
public void process (String source, String destination) {
try (InputStream fis = new FileInputStream(source);
OutputStream fos = new FileOutputStream(destination)
) {
byte [] buff = new byte[2014];
int i;
while ((i = fis.read(buff)) != -1) {
fos.write(buff,0,i); // line ***
}
} catch (IOException e) {
System.out.println(e.getClass());
}
}
What is the result?
A. Overrides the content of the destination file with the source file content
B. Appends the content of the source file to the destination file after a new line
C. Appends the content of the source file to the destination file without a break in the flow
D. Throws a runtime exception at line ***
Answer: A
Explanation: The whole of the FileInputStream will be read (see ** below).
The content of the FileInputStream will overwrite the destination file (see *** below).
* A FileInputStream obtains input bytes from a file in a file system. What files are available
depends on the host environment.
FileInputStream is meant for reading streams of raw bytes such as image data. For reading
streams of characters, consider using FileReader.
** FileInputStream.read (byte[] b)
Reads up to b.length bytes of data from this input stream into an array of bytes.
Parameters:
b – the buffer into which the data is read.
Returns:
the total number of bytes read into the buffer, or -1 if there is no more data because the
end of the file has been reached.
*** FileOutputStream
You can construct a FileOutputStream object by passing a string containing a path name or
a File object.
You can also specify whether you want to append the output to an existing file.
public FileOutputStream (String path)
public FileOutputStream (String path, boolean append)
public FileOutputStream (File file)
public FileOutputStream (File file, boolean append)
With the first and third constructors, if a file by the specified name already exists, the file
will be overwritten. To append to an existing file, pass true to the second or fourth
constructor.
Reference: Class FileInputStream
Reference: Class FileOutputStream
QUESTION NO:69
Which three statements are correct about thread\’s sleep method?
A. The sleep (long) method parameter defines a delay in milliseconds.
B. The sloop (long) method parameter defines a delay in microseconds.
C. A thread is guaranteed to continue execution after the exact amount of time defined in
the sleep (long) parameter.
D. A thread can continue execution before the amount of time defined in the sleep (long)
parameter.
E. A thread can continue execution after the amount of time defined in the sleep(long)
parameter
F. Only runtime exceptions are thrown by the sleep method.
G. A thread loses all object monitors (lock flags) when calling the sleep method.
Answer: A,C,E
Explanation: public static void sleep(long millis)
throws InterruptedException
Causes the currently executing thread to sleep (temporarily cease execution) for the
specified number of milliseconds (A, not B). The thread does not lose ownership of any
monitors (not G).
Parameters:
millis – the length of time to sleep in milliseconds.
Throws:
InterruptedException – if another thread has interrupted the current thread. The interrupted
status of the current thread is cleared when this exception is thrown.
QUESTION NO:57
Given:
final class FinalShow { // Line 1
final String location; // Line 2
FinalShow(final String loc) { // Line 3
location = loc; // Line 4
} // Line 5
FinalShow(String loc, String title) { // Line 6
location = loc; // Line 7
loc = “unknown”; // Line 8
} // Line 9
} // Line 10
What is the result?
A. Compilation succeeds.
B. Compilation fails due to an error on line 1.
C. Compilation fails due to an error on line 2.
D. Compilation fails due to an error on line 3.
E. Compilation fails due to an error on line 4.
F. Compilation fails due to an error on line 8.
Answer: A
Explanation:
QUESTION NO:49
Given:
interface Event {
String type = “Event”;
public void details();
}
class Quiz {
static String type = “Quiz”;
}
public classPracticeQuiz extends Quiz implements Event {
public void details() {
System.out.print(type);
}
public static void main(String[] args) {
new PracticeQuiz().details();
System.out.print(” ” type);
}
}
What is the result?
A. Event Quiz
B. Event Event
C. Quiz Quiz
D. Quiz Event
E. Compilation fails
Answer: C
Explanation:
QUESTION NO:62
A valid reason to declare a class as abstract is to:
A. define methods within a parent class, which may not be overridden in a child class
B. define common method signatures in a class, while forcing child classes to contain
unique method implementations
C. prevent instance variables from being accessed
D. prevent a class from being extended
E. define a class that prevents variable state from being stored when object Instances are
serialized
F. define a class with methods that cannot be concurrently called by multiple threads
Answer: B
Explanation: Note: An abstract method in Java is something like a pure virtual function in
C (i.e., a virtual function that is declared = 0). In C , a class that contains a pure virtual
function is called an abstract class and cannot be instantiated. The same is true of Java
classes that contain abstract methods.
Any class with an abstract method is automatically abstract itself and must be declared as
such.
An abstract class cannot be instantiated.
A subclass of an abstract class can be instantiated only if it overrides each of the abstract
methods of its superclass and provides an implementation (i.e., a method body) for all of
them. Such a class is often called a concrete subclass, to emphasize the fact that it is not
abstract.
If a subclass of an abstract class does not implement all the abstract methods it inherits,
that subclass is itself abstract.
static, private, and final methods cannot be abstract, since these types of methods cannot
be overridden by a subclass. Similarly, a final class cannot contain any abstract methods.
A class can be declared abstract even if it does not actually have any abstract methods.
Declaring such a class abstract indicates that the implementation is somehow incomplete
and is meant to serve as a superclass for one or more subclasses that will complete the
implementation. Such a class cannot be instantiated.
QUESTION NO:85
Given the code fragment:
What is the result, if the file salesreport.dat does not exist?
A. Compilation fails only at line 6
B. Compilation fails only at line 13
C. Compilation fails at line 6 and 13
D. Class java.io.IOException
E. Class java.io.FileNotFoundException
Answer: D
Explanation: Compilation works fine.
There will be a runtime error at line 6 (as the file salesreport.dat) does not exist.
This will be caught as an IOException at line 17.
QUESTION NO:41
Given the code fragment:
String query = “SELECT ID FROM Employee”;
try (Statement stmt = conn.createStatement()) {
ResultSet rs = stmt.executeQuery(query);
stmt.executeQuery(“SELECT ID FROM Customer”); // Line ***
while (rs.next()) {
// process the results
System.out.println (“Employee ID: ” rs.getInt(“ID”));
}
} catch (Exception e) {
System.err.println (“Error”);
}
Assume that the SQL queries return records. What is the result of compiling and executing
this code fragment?
A. The program prints employee IDs
B. The program prints customer IDs
C. The program prints Error
D. Compilation fails on line ***
Answer: A
Explanation: The program compiles and runs fine. Both executeQuery statements will run.
The first executeQuery statement (ResultSet rs = stmt.executeQuery(query);) will set the rs
Resultset. It will be used in the while loop. EmployIDs will be printed.
Note: Executes the given SQL statement, which returns a single ResultSet object.
Parameters:
sql – an SQL statement to be sent to the database, typically a static SQL SELECT
statement
Returns:
a ResultSet object that contains the data produced by the given query; never null
QUESTION NO:68
Which two forms of abstraction can a programmer use in Java?
A. enums
B. interfaces
C. primitives
D. abstract classes
E. concrete classes
F. primitive wrappers
Answer: B,D
Explanation: * When To Use Interfaces
An interface allows somebody to start from scratch to implement your interface or
implement your interface in some other code whose original or primary purpose was quite
different from your interface. To them, your interface is only incidental, something that have
to add on to the their code to be able to use your package. The disadvantage is every
method in the interface must be public. You might not want to expose everything.
* When To Use Abstract classes
An abstract class, in contrast, provides more structure. It usually defines some default
implementations and provides some tools useful for a full implementation. The catch is,
code using it must use your class as the base. That may be highly inconvenient if the other
programmers wanting to use your package have already developed their own class
hierarchy independently. In Java, a class can inherit from only one base class.
* When to Use Both
You can offer the best of both worlds, an interface and an abstract class. Implementors can
ignore your abstract class if they choose. The only drawback of doing that is calling
methods via their interface name is slightly slower than calling them via their abstract class
name.
Reference: http://mindprod.com/jgloss/interfacevsabstract.html
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