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QUESTION 1
Given the code fragment:
public void ReadFile (String source) {
char[] c = new char [128];
int cLen = c.length;
try (FileReader fr = new FileReader (source)) {
int count = 0;
int read = 0;
while ((read = fr.read(c)) != -1) {
count += read;
}
System.out.println(andquot;Read: andquot; + count + andquot; characters.andquot;);
} catch (IOException i) {
}
What change should you make to this code to read and write strings instead of character arrays?
A. Change FileReader to Readers.
B. Change FileReader to DataReader.
C. Change FileReader to File.
D. Change FileReader to BufferReader.
1Z0-804 exam Correct Answer: D
Explanation
public class BufferedReader
extends Reader
Read text from a character-input stream, buffering characters so as to provide for the efficient reading of characters,
arrays, and lines. The b

QUESTION 2
For which three objects must a vendor provide implementations in its JDBC driver?
A. Time
B. Date
C. Statement
D. ResultSet
E. Connection
F. SQLException
G. DriverManager
Correct Answer: CDE
Explanation
All JDBC drivers implement the four important JDBC classes: Driver, Connection, Statement, and ResultSet.

QUESTION 3
Which four are true about enums?
A. An enum is typesafe.
B. An enum cannot have public methods or fields.
C. An enum can declare a private constructor.
D. All enums implicitly implement Comparable.
E. An enum can subclass another enum.
F. An enum can implement an interface.
1Z0-804 dumps Correct Answer: ACDF
Explanation
C: The constructor for an enum type must be package-private or private access. Reference: Java Tutorials, Enum Types

QUESTION 4
Given:
interface Event {
String type = andquot;Eventandquot;;
public void details();
}
class Quiz { static String type = andquot;Quizandquot;;
}
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(andquot; andquot; + type);
} } What is the result?
A. Event Quiz
B. Event Event
C. Quiz Quiz
D. Quiz Event
E. Compilation fails
Correct Answer: C
Explanation

QUESTION 5
Given:
public class SleepOtherThread {
public static void main(String[] args) throws InterruptedException {
Runnable r = new Runnable() {
public void run() {
System.out.print(Thread.currentThread().getName());
}
};
Thread t1 = new Thread(r, andquot;One andquot;);
t1.start();
t1.sleep(2000); Thread t2 = new Thread(r, andquot;Two andquot;);
t2.start();
t2.sleep(1000);
System.out.print(andquot;Main andquot;);
}
}
What is the most likely result?
A. Main One Two
B. Main Two One
C. One Two Main
D. One Main Two
E. Two Main One
1Z0-804 pdf Correct Answer: C
Explanation

QUESTION 6
Give:
public class Test {
public static void main(String[] args) {
String svar= andquot;sports carsandquot;;
svar.replace(svar,andquot;convertiblesandquot;);
System.out.printf(andquot;There are %3$s %2$s and %d trucks.andquot;,5,svar,2+7);
}
}
What is the result?
A. There are 27 sports cars and 5 trucks
B. There are 27 convertibles and 5 trucks
C. There are 9 sports cars and 5 trucks
D. There are 9 convertibles and 5 trucks
E. IllegalFormatConversionException is thrown at runtime
Correct Answer: C
Explanation

QUESTION 7
Given:
public class Test { Integer x; // line 2
public static void main(String[] args) {
new Test().go(5);
}
void go(Integer i) { // line 6
System.out.print(x + ++i); // line 7
}
}
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
1Z0-804 vce Correct Answer: C
Explanation
The code compile finem but a java.lang.NullPointerException is thrown at runtime. X has no value. The code would run if line 2 was changed to: Integer x = 3;

QUESTION 8
Given the code fragment:
public class Base {
BufferedReader br;
String record;
public void process() throws FileNotFoundException {
br = new BufferedReader(new FileReader(andquot;manual.txtandquot;)); }
}
public class Derived extends Base {
// insert code here. Line ***
public static void main(String[] args) {
try {
new Derived().process();
} catch (Exception e) { }
}
}
Which code fragment inserted at line ***, enables the code to compile?
A. public void process () throws FileNotFoundException, IOException { super.process (); while ((record = br.readLine())
!= null) { System.out.println(record); } }
B. public void process () throws IOException { super.process (); while ((record = br.readLine()) != null) {
System.out.println(record); } }
C. public void process () throws Exception { super.process (); while ((record = br.readLine()) != null) {
System.out.println(record); } }
D. public void process (){ try { super.process ();
while ((record = br.readLine()) != null) {
System.out.println(record);
}
} catch (IOException | FileNotFoundException e) { }
}
E. public void process (){ try { super.process (); while ((record = br.readLine()) != null) { System.out.println(record); } }
catch (IOException e) {} }
Correct Answer: E
Explanation

QUESTION 9
Given:
import java.io.IOException; import java.io.file.Path;
import java.io.file.Paths;
public class Path12 {
public static void main(String s[]) throws IOException {
Path path = Paths.get(andquot;\\sales\\quarter\\..\\qtrlreport.txtandquot;);
path.relativize(Paths.get(andquot;\\sales\\annualreport.txtandquot;));
if(path.endsWith(andquot;annualreport.txtandquot;)) {
System.out.println(true);
} else {
System.out.println(false);
}
System.out.println(path);
}
}
What is the result?
A. false \sales\quarter\ . . \qtrlreport.txt
B. false \quarter\ . . \qtrlreport.txt
C. true . . \ . . \ . . \ annualreport.txt
D. true \ . . \ . . \annualreport.txt
1Z0-804 exam Correct Answer: A
Explanation
The relativize method that can be used to construct a relative path between two paths. relativize Path relativize(Path other)
Constructs a relative path between this path and a given path.

QUESTION 10
Given the interface:
Public interface Idgenerator {
int getNextId(); }
Which class implements IdGenerator in a thread-safe manner, so that no threads can get a duplicate id value current access?
A. Public class generator Implements IdGenerator { Private AtomicInteger id = new AtomicInteger (0); return id.incrementAndget(); } }
B. Public class Generator Implements idGenerator { private int id = 0; return ++id; } }
C. Public class Generator Implements IdGenerator { private volatile int Id = 0; return + + Id; }
D. Public class Generator Implements IdGenerator { private int id = 0; public int getNextId() { synchronized (new
Generator()) { return + + id; } } }
E. Public class Generator Implements IdGenerator { private int id = 0; public int getnextId() { synchronized (id) { return +
+ id; } } }
Correct Answer: D
Explanation
Code that is safe to call by multiple threads simultanously is called thread safe. If a piece of code is thread safe, then it
contains no race conditions. Race condition only occur when multiple threads update

QUESTION 11
Given:
public class Task {
String title;
static class Counter {
int counter = 0;
void increment() {counter++}
}
public static void main(String[] args) {
// insert code here
}
}
Which statement, inserted at line 8, enables the code to compile?
A. new Task().new Counter().increment();
B. new Task().Counter().increment();
C. new Task.Counter().increment(); D. Task.Counter().increment();
E. Task.Counter.increment();
1Z0-804 dumps Correct Answer: C
Explanation

QUESTION 12
Given:
import java.util.*;
public class CompareTest {
public static void main(String[] args) {
TreeSetandlt;Stringandgt; set1 = new TreeSetandlt;Stringandgt;(
new Comparatorandlt;Stringandgt;() {
public boolean compare(String s1, String s2) {
return s1.length() andgt; s2.length();
}
});
set1.add(andquot;peachandquot;);
set1.add(andquot;orangeandquot;);
set1.add(andquot;appleandquot;);
for (String n: set1) {
System.out.println(n);
}
}
}
What is the result?
A. peach orange apple
B. peach orange
C. apple orange
D. The program does not compile.
E. The program generates an exception at runtime.
Correct Answer: D
Explanation
The compiler has a problem with the line:
public boolean compare(String s1, String s2) {
return s1.length() andgt; s2.length();
error: andlt;anonymous comparetest.CompareTest$1andgt; is no

QUESTION 13
Given the code fragment:
String query = andquot;SELECT ID FROM Employeeandquot;;
try (Statement stmt = conn.createStatement()) {
ResultSet rs = stmt.executeQuery(query);
stmt.executeQuery(andquot;SELECT ID FROM Customerandquot;); // Line ***
while (rs.next()) {
// process the results
System.out.println (andquot;Employee ID: andquot; + rs.getInt(andquot;IDandquot;));
}
} catch (Exception e) {
System.err.println (andquot;Errorandquot;);
}
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
1Z0-804 pdf Correct 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

QUESTION 14
Given:
import java.util.ArrayDeque;
import java.util.Deque;
public class Counter {
public static void main(String[] args) {
Dequeandlt;Stringandgt; deq = new ArrayDequeandlt;Stringandgt;(2);
deq.addFirst(andquot;oneandquot;);
deq.addFirst(andquot;twoandquot;);
deq.addFirst(andquot;threeandquot;); // Line 9
System.out.print(deq.pollLast());
System.out.print(deq.pollLast());
System.out.print(deq.pollLast()); // Line 12
}
}
What is the result?
A. An exception is thrown at runtime on line 9.
B. An exception is thrown at runtime on line 12
C. one two null
D. one two three
E. two one null
F. three two one
Correct Answer: D
Explanation

QUESTION 15
Given:
import java.util.concurrent.atomic.AtomicInteger; public class AtomicCounter {
private AtomicInteger c = new AtomicInteger(0);
public void increment() {
// insert code here
}
}
Which line of code, inserted inside the increment () method, will increment the value of c?
A. c.addAndGet();
B. c++;
C. c = c+1;
D. c.getAndIncrement ();
1Z0-804 vce Correct Answer: D
Explanation
getAndIncrement
public final int getAndIncrement()
Atomically increment by one the current value.
Reference: java.util.concurrent.atomic

QUESTION 16
Given:
public class Dog {
protected String bark() {return andquot;woof andquot;; }
}
public class Beagle extends Dog {
private String bark() { return andquot;arf andquot;; }
}
public class TestDog {
public static void main(String[] args) {
Dog[] dogs = {new Dog(), new Beagle()};
for(Dog d: dogs) System.out.print(d.bark());
}
}
What is the result?
A. woof arf
B. woof woof
C. arf arf
D. A RuntimeException is generated
E. The code fails to compile
Correct Answer: A
Explanation

QUESTION 17
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
1Z0-804 exam Correct 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

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