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Exam Code: 1Z0-804
Exam Name: Java SE 7 Programmer II Exam
Updated: Feb 12, 2017
Q&As: 150
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1z0-804 dumps Question No : 1

Given the code fragment:
DataFormat df;
Which statement defines a new Dateformat object that displays the default date format for
the UK Locale?
A. df = DateFormat.getdatDataInstance (DateFormat.DEFAULT, Locale (UK));
B. df = DateFormat.getdatDataInstance (DateFormat.DEFAULT, UK);
C. df = DateFormat.getdatDataInstance (DateFormat.DEFAULT, Locale.UK);
D. df = new DateFormat.getdatDataInstance (DateFormat.DEFAULT, Locale.UK);
E. df = new DateFormat.getdatDataInstance (DateFormat.DEFAULT, Locale (UK));
Answer: C
Explanation: The UK locale is constructed with Locale.UK.
Example:
To format a date for a different Locale, specify it in the call to getDateInstance().
DateFormat df = DateFormat.getDateInstance(DateFormat.LONG, Locale.FRANCE);
Note: getDateInstance(int style, Locale aLocale)
Gets the date formatter with the given formatting style for the given locale.
Reference: Class DateFormat
Given:
public class DoubleThread {
public static void main(String[] args) {
Thread t1 = new Thread() {
public void run() {
System.out.print(“Greeting”);

1z0-804 dumps Question No : 2

}
};
Thread t2 = new Thread(t1); // Line 9
t2.run();
} }
Which two are true?
A. A runtime exception is thrown on line 9.
B. No output is produced.
C. Greeting is printed once.
D. Greeting is printed twice.
E. No new threads of execution are started within the main method.
F. One new thread of execution is started within the main method.
G. Two new threads of execution are started within the main method.
Answer: C,E
Explanation: Thread t2 is executed. Execution of T2 starts executionen of t1. Greeting is
printed during the execution of t1.

1z0-804 dumps Question No : 3

Given:
import java.util.*;
public class AccessTest {
public static void main(String[] args) {
Thread t1 = new Thread(new WorkerThread());
Thread t2 = new Thread(new WorkerThread());
t1.start(); t2.start; // line1
}
}
class WorkPool {
static ArrayList<Integer> list = new ArrayList<>(); // line2
public static void addItem() { // line3
list.add(1); // Line4
} }
class WorkerThread implements Runnable {
static Object bar = new Object ();
public void run() { //line5
for (int i=0; i<5000;i++) WorkPool.addItem(); // line6
} }
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();)
B. Replace Line 2 with:
static CopyWriteArrayList<Integer> list = new CopyWriteArrayList<>();
C. Replace line 3 with:
synchronized public static void addItem () {
D. Replace line 4 with:
synchronized (list) (list.add(1);)
E. Replace line 5 with:
Synchronized public void run () {
F. replace line 6 with:
Synchronized (this) {for (in i = 0, i<5000, i++) WorkPool.addItem(); }
G. Replace line 6 with:
synchronized (bar) {for (int i= 0; i<5000; i++) WorkPool.addItem(); }
Answer: A,B,C,F
Explanation: B: CopyOnWriteArrayList
A thread-safe variant of ArrayList in which all mutative operations (add, set, and so on) are
implemented by making a fresh copy of the underlying array.
This is ordinarily too costly, but may be more efficient than alternatives when traversal
operations vastly outnumber mutations, and is useful when you cannot or don’t want to
synchronize traversals, yet need to preclude interference among concurrent threads. The
“snapshot” style iterator method uses a reference to the state of the array at the point that
the iterator was created. This array never changes during the lifetime of the iterator, so
interference is impossible and the iterator is guaranteed not to throw
ConcurrentModificationException
Note:
* The Java programming language provides two basic synchronization idioms:
synchronized methods and synchronized statements.
* To make a method synchronized, simply add the synchronized keyword to its declaration:
Example:
public class SynchronizedCounter {
private int c = 0;
public synchronized void increment() {
c++;
}
}
* A way to create synchronized code is with synchronized statements. Unlike synchronized
methods, synchronized statements must specify the object that provides the intrinsic 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 also needs to avoid synchronizing invocations of other objects’ methods.
Without synchronized statements, there would have to be a separate, unsynchronized
method for the sole purpose of invoking nameList.add.
Reference: The Java Tutorial, Intrinsic Locks and Synchronization
Question No : 4

Sam has designed an application. It segregates tasks that are critical and executed
frequently from tasks that are non critical and executed less frequently. He has prioritized
these tasks based on their criticality and frequency of execution. After close scrutiny, he
finds that the tasks designed to be non critical are rarely getting executed.
From what kind of problem is the application suffering?
A. race condition
B. starvation
C. deadlock
D. livelock
Answer: C
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 Tutorial, Starvation and Livelock

1z0-804 dumps Question No : 5

Give:
Class Employee {
public int checkEmail() {/* . . . */}
public void sendEmail (String email) {/* . . . */}
public Boolean validDateEmail(){/* . . . */}
public void printLetter (String letter) {/* . . . */}
Which is correct?
A. Employee takes advantage of composition.
B. Employee “has-an” Email.
C. Employee “is-a” LetterPrinter.
D. Employee has low cohesion.
Answer: D
Explanation: The relationship between Employee and e-mail is poorly implemented here.
There is low cohesion.
Note:
Low cohesion is associated with undesirable traits such as being difficult to maintain,
difficult to test, difficult to reuse, and even difficult to understand.
Cohesion is decreased if:
The functionalities embedded in a class, accessed through its methods, have little in
common.
Methods carry out many varied activities, often using coarsely-grained or unrelated sets of
data.
Disadvantages of low cohesion (or “weak cohesion”) are:
Increased difficulty in understanding modules.
Increased difficulty in maintaining a system, because logical changes in the domain affect
multiple modules, and because changes in one module require changes in related
modules.
Increased difficulty in reusing a module because most applications won’t need the random
set of operations provided by a module.
Reference: Cohesion (computer science)

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