Free Java SE 1z0-809 Ultimate Study Guide (Updated 195 Questions)
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NEW QUESTION 35
Given the code fragment:
What is the result?
- A. Java EEJava SE
- B. Java EESE
- C. The program prints either:
Java EEJava SE
or
Java SEJava EE - D. Java EEJava EESE
Answer: A
NEW QUESTION 36
Given:
IntStream stream = IntStream.of (1,2,3); IntFunction<Integer> inFu= x -> y -> x*y;//line n1 IntStream newStream = stream.map(inFu.apply(10));//line n2
newStream.forEach(System.output::print);
Which modification enables the code fragment to compile?
- A. Replace line n2 with:
IntStream newStream = stream.map(inFu.applyAsInt (10)); - B. Replace line n1 with:
BiFunction<IntUnaryOperator> inFu = x -> y -> x*y; - C. Replace line n1 with:
IntFunction<UnaryOperator> inFu = x -> y -> x*y; - D. Replace line n1 with:
IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;
Answer: A
NEW QUESTION 37
Given the code fragment:
Path file = Paths.get ("courses.txt");
// line n1
Assume the courses.txtis accessible.
Which code fragment can be inserted at line n1to enable the code to print the content of the courses.txtfile?
- A. List<String> fc = Files.list(file);
fc.stream().forEach (s - > System.out.println(s)); - B. Stream<String> fc = Files.lines (file);
fc.forEach (s - > System.out.println(s)); - C. Stream<String> fc = Files.readAllLines (file);
fc.forEach (s - > System.out.println(s)); - D. List<String> fc = readAllLines(file);
fc.stream().forEach (s - > System.out.println(s));
Answer: C
NEW QUESTION 38
Given the code fragment:
Which should be inserted into line n1to print Average = 2.5?
- A. IntStream str = IntStream.of (1, 2, 3, 4);
- B. IntStream str = Stream.of (1, 2, 3, 4);
- C. Stream str = Stream.of (1, 2, 3, 4);
- D. DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);
Answer: D
NEW QUESTION 39
Given:
class Sum extends RecursiveAction { //line n1
static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex;
int [ ] data;
public Sum (int [ ]data, int start, int end) {
this.data = data;
this stIndex = start;
this. lstIndex = end;
}
protected void compute ( ) {
int sum = 0;
if (lstIndex - stIndex <= THRESHOLD_SIZE) {
for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( );
new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}
and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( );
int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
fjPool.invoke (new Sum (data, 0, data.length));
and given that the sum of all integers from 1 to 10 is 55.
Which statement is true?
- A. The program prints several values whose sum exceeds 55.
- B. The program prints several values that total 55.
- C. The program prints 55.
- D. A compilation error occurs at line n1.
Answer: B
NEW QUESTION 40
Given the code fragment:
List<String> nL = Arrays.asList("Jim", "John", "Jeff");
Function<String, String> funVal = s -> "Hello : ".concat(s);
nL.Stream()
.map(funVal)
.forEach(s-> System.out.print (s));
What is the result?
- A. Hello : Jim Hello : John Hello : Jeff
- B. A compilation error occurs.
- C. Jim John Jeff
- D. The program prints nothing.
Answer: D
Explanation:
Explanation
The program prints nothing because the method is concat.
NEW QUESTION 41
Given the records from the Employee table:
and given the code fragment:
try {
Connection conn = DriverManager.getConnection (URL, userName,
passWord);
Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
st.execute("SELECT*FROM Employee");
ResultSet rs = st.getResultSet();
while (rs.next()) {
if (rs.getInt(1) ==112) {
rs.updateString(2, "Jack");
}
}
rs.absolute(2);
System.out.println(rs.getInt(1) + " " + rs.getString(2));
} catch (SQLException ex) {
System.out.println("Exception is raised");
}
Assume that:
- The required database driver is configured in the classpath.
- The appropriate database accessible with the URL, userName, and
passWord exists.
What is the result?
- A. The program prints Exception is raised.
- B. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jack - C. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jerry - D. The Employee table is not updated and the program prints:
112 Jerry
Answer: D
NEW QUESTION 42
Given the code fragment:
What is the result?
- A. The code reads the password without echoing characters on the console.
- B. A compilation error occurs at line n1.
- C. A compilation error occurs because the IOExceptionisn’t declared to be thrown or caught?
- D. A compilation error occurs at line n2.
Answer: C
NEW QUESTION 43
Given:
And given the code fragment:
Which two modifications enable the code to print the following output?
Canine 60 Long
Feline 80 Short
- A. Replace line n2 with:
super (type, maxSpeed) ;
this.bounds = bounda; - B. Replace line n1 with:
super ( ) ;
this.bounds = bounds; - C. Replace line n1 with:
this.bounds = bounda;
super ( ) ; - D. Replace line n2 with:
super (type,maxSpeed) ;
this (bounds) ; - E. Replace line n1 with:
this ("Canine",60);
this.bounds = bounds;
Answer: B
NEW QUESTION 44
Given the code fragment:
Which two modifications should you make so that the code compiles successfully?
- A. Replace line 5 with public void printFileContent ( ) throws IOException (
- B. Replace line 7 with throw IOException ("Exception raised");
- C. Replace line 11 with public static void main (String [ ] args) throws Exception (
- D. Replace line 13 with:
- E. At line 14, insert throw new IOException ( );
Answer: A,C
NEW QUESTION 45
Given:
Item table
ID, INTEGER: PK
DESCRIP, VARCHAR(100)
PRICE, REAL
QUANTITY< INTEGER
And given the code fragment:
9. try {
10.Connection conn = DriveManager.getConnection(dbURL, username,
password);
11. String query = "Select * FROM Item WHERE ID = 110";
12. Statement stmt = conn.createStatement();
13. ResultSet rs = stmt.executeQuery(query);
14.while(rs.next()) {
15.System.out.println("ID:" + rs.getInt("Id"));
16.System.out.println("Description:" + rs.getString("Descrip"));
17.System.out.println("Price:" + rs.getDouble("Price"));
18. System.out.println(Quantity:" + rs.getInt("Quantity"));
19.}
20. } catch (SQLException se) {
21. System.out.println("Error");
22. }
Assume that:
- The required database driver is configured in the classpath.
- The appropriate database is accessible with the dbURL, userName, and
passWord exists.
- The SQL query is valid.
What is the result?
- A. An exception is thrown at runtime.
- B. Compilation fails.
- C. The code prints information about Item 110.
- D. The code prints Error.
Answer: C
NEW QUESTION 46
Given the code fragment:
Which two code fragments, when inserted at line n1 independently, result in the output PEEK: Unix?
- A. .allMatch ();
- B. .findFirst ();
- C. .noneMatch ();
- D. .anyMatch ();
- E. .findAny ();
Answer: B,E
NEW QUESTION 47
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs because the tryblock doesn't have a catchor finallyblock.
- B. The program compiles successfully.
- C. A compilation error occurs at line n1.
- D. A compilation error occurs at line n2.
Answer: A
NEW QUESTION 48
Given:
class FuelNotAvailException extends Exception { }
class Vehicle {
void ride() throws FuelNotAvailException {//line n1
System.out.println("Happy Journey!");
}
}
class SolarVehicle extends Vehicle {
public void ride () throws Exception {//line n2
super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws FuelNotAvailException, Exception {
Vehicle v = new SolarVehicle ();
v.ride();
}
Which modification enables the code fragment to print Happy Journey!?
- A. Replace line n2 with void ride() throws Exception {
- B. Replace line n2 with private void ride() throws FuelNotAvailException {
- C. Replace line n1 with protected void ride() throws Exception {
- D. Replace line n1 with public void ride() throws FuelNotAvailException {
Answer: C
NEW QUESTION 49
Given:
public class Emp {
String fName;
String lName;
public Emp (String fn, String ln) {
fName = fn;
lName = ln;
}
public String getfName() { return fName; }
public String getlName() { return lName; }
}
and the code fragment:
List<Emp> emp = Arrays.asList (
new Emp ("John", "Smith"),
new Emp ("Peter", "Sam"),
new Emp ("Thomas", "Wale"));
emp.stream()
//line n1
.collect(Collectors.toList());
Which code fragment, when inserted at line n1, sorts the employees list in descending order of fNameand then ascending order of lName?
.sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing
- A. (Emp::getlName).reserved
- B. (Emp::getlName))
.sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName)) - C. .map(Emp::getfName).sorted(Comparator.reserveOrder())
- D. .map(Emp::getfName).sorted(Comparator.reserveOrder().map
Answer: C
NEW QUESTION 50
Which two class definitions fail to compile?
- A. Option D
- B. Option B
- C. Option A
- D. Option E
- E. Option C
Answer: A,E
Explanation:
There is no class such as "final abstract..." and "protected static final int i" variable i must be initialized.
NEW QUESTION 51
Given:
and the code fragment:
What is the result?
- A. 0
- B. A compilation error occurs at line n1.
- C. An Exception is thrown at run time.
- D. 1
Answer: A
NEW QUESTION 52
Given the code fragments:
public class Book implements Comparator<Book> {
String name;
double price;
public Book () {}
public Book(String name, double price) {
this.name = name;
this.price = price;
}
public int compare(Book b1, Book b2) {
return b1.name.compareTo(b2.name);
}
public String toString() {
return name + ":" + price;
}
}
and
List<Book>books = Arrays.asList (new Book ("Beginning with Java", 2),
new book ("A
Guide to Java Tour", 3));
Collections.sort(books, new Book());
System.out.print(books);
What is the result?
- A. A compilation error occurs because the Book class does not override the abstract method compareTo().
- B. An Exception is thrown at run time.
- C. [Beginning with Java:2, A Guide to Java Tour:3]
- D. [A Guide to Java Tour:3, Beginning with Java:2]
Answer: D
NEW QUESTION 53
Given the code fragment:
Path p1 = Paths.get("/Pics/MyPic.jpeg"); System.out.println (p1.getNameCount() + ":" + p1.getName(1) + ":" + p1.getFileName());
Assume that the Pics directory does NOT exist. What is the result?
- A. 2:MyPic.jpeg: MyPic.jpeg
- B. 2:Pics: MyPic.jpeg
- C. An exception is thrown at run time.
- D. 1:Pics:/Pics/ MyPic.jpeg
Answer: D
NEW QUESTION 54
Given the code fragment:
public class Foo {
public static void main (String [ ] args) {
Map<Integer, String> unsortMap = new HashMap< > ( );
unsortMap.put (10, "z");
unsortMap.put (5, "b");
unsortMap.put (1, "d");
unsortMap.put (7, "e");
unsortMap.put (50, "j");
Map<Integer, String> treeMap = new TreeMap <Integer, String> (new
Comparator<Integer> ( ) {
@Override public int compare (Integer o1, Integer o2) {return o2.compareTo
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {
System.out.print (entry.getValue () + " ");
}
}
}
What is the result?
- A. z b d e j
- B. A compilation error occurs.
- C. j z e b d
- D. d b e z j
Answer: C
NEW QUESTION 55
Which two statements are true about localizing an application? (Choose two.)
- A. Language codes use lowercase letters and region codes use uppercase letters.
- B. Textual elements (messages and GUI labels) are hard-coded in the code.
- C. Resource bundle files include data and currency information.
- D. Support for new regional languages does not require recompilation of the code.
- E. Language and region-specific programs are created using localized data.
Answer: A,D
Explanation:
Explanation/Reference:
Reference: http://docs.oracle.com/javase/7/docs/technotes/guides/intl/
NEW QUESTION 56
Given:
and
Which interface from the java.util.function package should you use to refactor the class Txt?
- A. Consumer
- B. Predicate
- C. Function
- D. Supplier
Answer: D
NEW QUESTION 57
Given the code fragment:
What is the result?
David
- A. Allen
[Susan]
Susan - B. Allen
[Susan, David] - C. Allen
[David]
David - D. David
[Susan, Allen]
Susan - E. Susan
[Susan, Allen]
Susan
Answer: C
Explanation:
NEW QUESTION 58
......
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