Real 1z0-809 Exam PDF Test Engine Practice Test Questions
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Difficulty in writing 1Z0-809 Exam
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NEW QUESTION 60
Given the code fragment:
Assume that the value of now is 6:30 in the morning.
What is the result?
- A. 0
- B. 1
- C. An exception is thrown at run time.
- D. 2
Answer: A
NEW QUESTION 61 
What is the result?
- A. A compilation error occurs at line 8.
- B. 0
- C. A compilation error occurs at line 7.
- D. A compilation error occurs at line 15.
Answer: C
NEW QUESTION 62
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 63
Which action can be used to load a database driver by using JDBC3.0?
- A. Use the DriverManager.getDriver method to load the driver class.
- B. Use the java.lang.Class.forName method to load the driver class.
- C. Add the driver class to the META-INF/services folder of the JAR file.
- D. Include the JDBC driver class in a jdbc.properties file.
Answer: A
NEW QUESTION 64
Given:
interface Rideable {Car getCar (String name); }
class Car {
private String name;
public Car (String name) {
this.name = name;
}
}
Which code fragment creates an instance of Car?
- A. Car auto = Car ("MyCar"): : new;
- B. Car auto = Car : : new;Car vehicle = auto : : getCar("MyCar");
- C. Rideable rider = Car : : new;Car vehicle = rider.getCar("MyCar");
- D. Car vehicle = Rideable : : new : : getCar("MyCar");
Answer: C
NEW QUESTION 65
Given the code fragment:
What is the result?
- A. 6 : 5 : 6
- B. 5 : 3 : 6
- C. 4 : 4 : 4
- D. 3 : 3 : 4
Answer: B
NEW QUESTION 66
Given the code fragment:
BiFunction<Integer, Double, Integer> val = (t1, t2) -> t1 + t2;//line n1
System.out.println(val.apply(10, 10.5));
What is the result?
- A. 20.5
- B. A compilation error occurs at line n1.
- C. 0
- D. A compilation error occurs at line n2.
Answer: B
NEW QUESTION 67
Given:
public enum USCurrency {
PENNY (1),
NICKLE(5),
DIME (10),
QUARTER(25);
private int value;
public USCurrency(int value) {
this.value = value;
}
public int getValue() {return value;}
}
public class Coin {
public static void main (String[] args) {
USCurrency usCoin =new USCurrency.DIME;
System.out.println(usCoin.getValue()):
}
}
Which two modifications enable the given code to compile?
- A. Remove the newkeyword from the instantion of usCoin.
- B. Make the getter method of valueas a staticmethod.
- C. Nest the USCurrencyenumeration declaration within the Coinclass.
- D. Make the USCurrencyenumeration constructor private.
- E. Add the finalkeyword in the declaration of value.
Answer: C,E
NEW QUESTION 68
Which two statements are true for a two-dimensional array of primitive data type?
- A. The length of each dimension must be the same.
- B. It cannot contain elements of different types.
- C. At the declaration time, the number of elements of the array in each dimension must be specified.
- D. All methods of the class object may be invoked on the two-dimensional array.
Answer: B,D
NEW QUESTION 69
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 Employee table is updated with the row:
112 Jack
and the program prints:
112 Jack - B. The Employee table is not updated and the program prints:
112 Jerry - C. The program prints Exception is raised.
- D. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jerry
Answer: C
NEW QUESTION 70
Given the code fragment:
List<Integer> codes = Arrays.asList (10, 20);
UnaryOperator<Double> uo = s -> s +10.0;
codes.replaceAll(uo);
codes.forEach(c -> System.out.println(c));
What is the result?
- A. 10
20 - B. A NumberFormatException is thrown at run time.
- C. A compilation error occurs.
- D. 20.0
30.0
Answer: D
NEW QUESTION 71
Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (".class"))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files
and is passed as an argument to the recDelete () method when it is
invoked.
What is the result?
- A. The method deletes all the .class files in the Projects directory and its subdirectories.
- B. The method executes and does not make any changes to the Projects directory.
- C. The method throws an IOException.
- D. The method deletes the .class files of the Projects directory only.
Answer: A
NEW QUESTION 72
Given the code fragments:
class Employee {
Optional<Address> address;
Employee (Optional<Address> address) {
this.address = address;
}
public Optional<Address> getAddress() { return address; }
}
class Address {
String city = "New York";
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = null;
Optional<Address> addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not available"; What is the result?
- A. A NoSuchElementException is thrown at run time.
- B. null
- C. City Not available
- D. New York
Answer: C
Explanation:
Explanation/Reference:
NEW QUESTION 73
Given the structure of the STUDENT table:
Student (id INTEGER, name VARCHAR)
Given:
public class Test {
static Connection newConnection =null;
public static Connection get DBConnection () throws SQLException {
try (Connection con = DriveManager.getConnection(URL, username, password)) {
newConnection = con;
}
return newConnection;
}
public static void main (String [] args) throws SQLException {
get DBConnection ();
Statement st = newConnection.createStatement();
st.executeUpdate("INSERT INTO student VALUES (102, 'Kelvin')");
}
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the URL, userName, and passWord exists.
The SQL query is valid.
What is the result?
- A. A SQLException is thrown as runtime.
- B. The program executes successfully and the STUDENT table is NOT updated with any record.
- C. The program executes successfully and the STUDENT table is updated with one record.
- D. A NullPointerException is thrown as runtime.
Answer: D
NEW QUESTION 74
Given:
class Bird {
public void fly () { System.out.print("Can fly"); }
}
class Penguin extends Bird {
public void fly () { System.out.print("Cannot fly"); }
}
and the code fragment:
class Birdie {
public static void main (String [ ] args) {
fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?
- A. static void fly (Consumer<? extends Bird> bird) { bird.accept( ) fly ();
} - B. static void fly (Supplier<? extends Bird> bird) { LOST
- C. static void fly (Supplier<Bird> bird) {
bird.get( ) fly ();
} - D. static void fly (Consumer<Bird> bird) {
bird :: fly ();
}
Answer: C
Explanation:
Very confusing question. There is no logic in the options.
NEW QUESTION 75
Given:
What change should you make to guarantee a single order of execution (printed values 1 -100 in order)?
- A. Line 2: public synchronized int value;
- B. Line 3: public synchronized void run() {
- C. Line 2: public volatile int value;
- D. Line 1: class MyClass extends Thread {
Answer: D
NEW QUESTION 76
Given:
public final class IceCream {
public void prepare() {}
}
public class Cake {
public final void bake(int min, int temp) {}
public void mix() {}
}
public class Shop {
private Cake c = new Cake ();
private final double discount = 0.25;
public void makeReady () { c.bake(10, 120); }
}
public class Bread extends Cake {
public void bake(int minutes, int temperature) {}
public void addToppings() {}
}
Which statement is true?
- A. A compilation error occurs in IceCream.
- B. All classes compile successfully.
- C. A compilation error occurs in Cake.
- D. A compilation error occurs in Shop.
- E. A compilation error occurs in Bread
Answer: E
NEW QUESTION 77
Given:
What is the result?
-catch-
- A. -dostuff-
-catch- - B. -finally-
- C. -finally-
-dostuff-
-catch- - D. -catch-
-finally
Answer: D
Explanation:
NEW QUESTION 78
Which statement is true about java.time.Duration?
- A. It defines date-based values.
- B. It tracks time zones.
- C. It defines time-based values.
- D. It preserves daylight saving time.
Answer: C
NEW QUESTION 79
Given the code fragments:
class MyThread implements Runnable {
private static AtomicInteger count = new AtomicInteger (0);
public void run () {
int x = count.incrementAndGet();
System.out.print (x+" ");
}
}
and
Thread thread1 = new Thread(new MyThread());
Thread thread2 = new Thread(new MyThread());
Thread thread3 = new Thread(new MyThread());
Thread [] ta = {thread1, thread2, thread3};
for (int x= 0; x < 3; x++) {
ta[x].start();
}
Which statement is true?
- A. The program prints 1 1 1.
- B. The program prints 1 2 3 and the order is unpredictable.
- C. The program prints 1 2 3.
- D. A compilation error occurs.
Answer: C
NEW QUESTION 80
Given:
What is the result?
- A. 10 Hello Hello 121
- B. 10 Hello 11
- C. 100 Hello Hello 121
- D. 100 Hello 121
- E. 10 Hello Hello 11
Answer: E
NEW QUESTION 81
Given:
Your design requires that:
* fuelLevel of Engine must be greater than zero when the start()method is invoked.
* The code must terminate if fuelLevelof Engineis less than or equal to zero.
Which code fragment should be added at line n1to express this invariant condition?
- A. assert (fuelLevel) : "Terminating...";
- B. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- C. assert fuelLevel < 0: System.exit(0);
- D. assert fuelLevel > 0: "Impossible fuel" ;
Answer: C
NEW QUESTION 82
......
Given that this exam is at the professional level of certification, candidates have a large amount of work to do. Therefore, the first thing that is recommended is to thoroughly review the complete list of topics available on the official exam page, which includes:
- NIO.2, Path Interface, and Files Class.
- Advanced Class Design. Specifically, candidates must demonstrate skills in how to implement encapsulation, polymorphism, and inheritance.
- Java Concurrency. The candidates must be able to create worker threads, as well as to use parallel Fork/Join Framework and parallel Streams.
- Generics and Collections. This allows the candidate to create and use a generic class as well as ArrayList, TreeSet, TreeMap, and ArrayDeque objects.
- Exceptions and Assertions. In other words, how to use try-catch and throw statements, alongside creating custom exceptions and Auto-closeable resources.
- Stream API. It means the code development that uses optional class, Stream data, and calculation methods in addition to sorting a collection using Stream API.
- Localization. In particular how to read and set the locale by using the Locale object, to create and read a Properties file, and to build a recourse bundle for each locale.
- I/O Fundamentals. It means the skill of reading and writing data from the console.
To apply for this Oracle certification test, you should first pay $245 for a voucher. After that, go to Pearson VUE and log into your account. Enter the exam code, which should be 1Z0-809, and follow the instructions that will pop up.
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