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Q11. Given:
What is the result?
A. 5
B. 6
C. An exception is thrown at runtime
D. Compilation fails due to an error on line 6
E. Compilation fails due to an error on line 7
Answer: C
Explanation:
The code compile fine but java.lang.NullPointerException is thrown at runtime.
x has no value. The code would run if line 2 was changed to:
Integer x = 3;
Q12. ITEM Table
*
ID, INTEGER: PK
*
DESCRIP, VARCHAR(100)
*
PRICE, REAL
*
QUALITY, INTEGER
And given the code fragment (assuming that the SQL query is valid):
What is the result of compiling and executing this code?
A. An exception is thrown at runtime
B. Compile fails
C. The code prints Error
D. The code prints information about Item 110
Answer: C
Explanation:
Tricky:
Compiles successfully ! Not B !
D is correct, if Column Quantity instead of Quality
Table Item Column Quality --- System.out.println("Quantity: " + rs.getInt("Quantity"));
wenn jedoch so gewollt: die Zeile gibt Error aus (die anderen funktionieren) !!!
The connection conn is not defined. The code will not compile.
Q13. Given:
Which two statements are true about the writer class?
A. It compiles without any changes.
B. It compiles if the code void write (String s); is added at line***.
C. It compiles if the code void write (); is added at line ***.
D. It compiles if the code void write (string s) { } is added at line ***.
E. It compiles if the code write () {}is added at line ***.
Answer: A
Explanation:
An abstract class does not need to implement the interface methods.
Q14. Given:
What is the result?
A. Compilation fails.
B. 78class java.lang.Array.IndexOutOfBoundException
C. class MarkOutOfBoundException
D. class java.lang.arrayIndexOutOfBoundException
Answer: A
Explanation:
The exception MarkOutOfBoundsException is already caught by the alternative ArrayIndexOutOfBoundsException
Q15. Given: What is the result?
A. woof arf
B. woof woof
C. arf arf
D. A RuntimeException is generated
E. The code fails to compile
Answer: E
Explanation:
class Dog {
protected String bark()
public class Beagle extends Dog {
private String bark()
Cannot reduce the visibility of the inherited method from Dog
Q16. Given the following incorrect program:
Which two changes make the program work correctly?
A. Results must be retrieved from the newly created MyTask instances and combined.
B. The threshold value must be increased so that the overhead of task creation does not dominate the cost ofcomputation.
C. The midpoint computation must be altered so that it splits the workload in an optimal manner.
D. The compute () method must be changed to return an Integer result.
E. The compute () method must be enhanced to (fork) newly created tasks.
F. The myTask class must be modified to extend RecursiveAction instead of RecursiveTask
Answer: A,D
Explanation:
Note 1: A RecursiveTask is a recursive result-bearing ForkJoinTask. Note 2: The invokeAll(ForkJoinTask<?>… tasks) forks the given tasks, returning when isDone holds for eachtask or an (unchecked) exception is encountered, in which case the exception is rethrown. Note 3: Using the fork/join framework is simple. The first step is to write some code that performs a segmentof the work. Your code should look similar to this: if (my portion of the work is small enough) do the work directly else split my work into two pieces invoke the two pieces and wait for the results Wrap this code as a ForkJoinTask subclass, typically as one of its more specialized types RecursiveTask (which can return a result) or RecursiveAction.
Q17. Given the code format:
SimpleDateFormat sdf;
Which code statements will display the full text month name?
A. sdf = new SimpleDateFormat ("mm", Locale.UK); System.out.println("Result:", sdf.format(new date()));
B. sdf = new SimpleDateFormat ("MM", Locale.UK); System.out.println("Result:", sdf.format(new date()));
C. sdf = new SimpleDateFormat ("MMM", Locale.UK); System.out.println("Result:", sdf.format(new date()));
D. sdf = new SimpleDateFormat ("MMMM", Locale.UK); System.out.println("Result:", sdf.format(new date()));
Answer: D
Explanation:
Typical output would be Current Month in M format: 2 Current Month in MM format: 02 Current Month in MMM format: Feb Current Month in MMMM format: February
Q18. Given the Greetings.properties file, containing:
What is the result?
A. Compilation fails
B. HELLO_MSG
C. GOODGYE_NSG
D. Hello, everyone!
E. Goodbye everyone!
Answer: A
Explanation:
The code will not compile.
The problem is the following line:
System.out.println(resource.getObject(1));
In particular getObject(1) throws the following error:
Exception in thread "main" java.lang.RuntimeException: Uncompilable source code -Erroneous sym type:
<any>.loadResourceBundle
Note:getObject(String key) !!! String keyGets an object for the given key from this resource
bundle or one of its parents.
Q19. Given: Which of the four are valid modifications to synchronize access to the valid list between threads t1 and t2?
A. Replace line 1 with:
Synchronized (t2) (t1.start();) synchronized(t1) (t2.start(); )
korrekte Schreibweise: synchronized (t2) {t1.start();} synchronized(t1) { t2.start();}
B. Replace Line 2 with:
static CopyWriteArrayList<Integer> list = new CopyWriteArrayList<>();
korrekte Schreibweise: static CopyOnWriteArrayList<Integer> list = new
CopyOnWriteArrayList<>();
C. Replace line 3 with:
synchronized public static void addItem () {
korrekte Schreibweise: synchronized public static void addItem () {
D. Replace line 4 with:
synchronized (list) (list.add(1);)
korrekte Schreibweise: synchronized (list) { (list.add(1); }
E. Replace line 5 with:
Synchronized public void run () {
korrekte Schreibweise: synchronized public void run () {
F. replace line 6 with:
Synchronized (this) {for (in i = 0, i<5000, i++) WorkPool.addItem(); }
korrekte Schreibweise: synchronized (this) {for (int i = 0; i<500; i++) WorkPool.addItem(); }
G. Replace line 6 with:
synchronized (bar) {for (int i= 0; i<5000; i++) WorkPool.addItem(); }
korrekte Schreibweise: synchronized (bar) {for (int i= 0; i<500; i++) WorkPool.addItem(); }
Answer: B,C,D
Explanation:
Away to create synchronized code is with synchronized statements.
Unlike synchronized methods, synchronized statements must specify the object that
provides theintrinsic lock:
For example:
public void addName(String name) {
synchronized(this) {
lastName = name;
nameCount++;
}
nameList.add(name);
}
In this example, the addName method needs to synchronize changes to lastName and
nameCount, but alsoneeds to avoid synchronizing invocations of other objects' methods.
Without synchronized statements, therewould have to be a separate, unsynchronized
method for the sole purpose of invoking nameList.add.
Reference: The Java Tutorial,Intrinsic Locks and Synchronization
Q20. Given: What is the result?
A. false false
B. true false
C. true true
D. Compilation fails
E. An exception is thrown at runtime
Answer: A
Explanation:
(this == obj) is the object implementation of equals() and therefore FALSE, if the reference
points to variousobjectsand then the super.equals() is invoked, the object method equals()
what still result in FALSEbetter override of equals() is to compare the attributes like:
public boolean equals (Object obj) {
if (obj != null){
Product p = (Product)obj;
return this.id == p.id;
}
return false;
}