Oracle Exam 2022 1z0-809 Dumps Updated Questions UPDATED Nov-2022
Get The Most Updated 1z0-809 Dumps To Java SE Certification
Conclusion
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So now that you see the benefits and are ready to continue on the path to Oracle certification, enroll for the Oracle 1Z0-809 exam and start preparing diligently. You have all the possibilities in your hands, it is enough to cast aside doubts and start studying hard to get ahead of the challenging job market.
Certification Path
Oracle Java SE 8 Programmer I can act as a prerequisite for this 1Z0-809 exam.
NEW QUESTION 104
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<Bird> bird) {
bird :: fly (); } - B. static void fly (Supplier<Bird> bird) {
bird.get( ) fly ();
} - C. static void fly (Consumer<? extends Bird> bird) {
bird.accept( ) fly ();
} - D. static void fly (Supplier<? extends Bird> bird) {
LOST
Answer: B
Explanation:
NOTE: Very confusing question. There is no logic in the options.
NEW QUESTION 105
Given:
and the code fragment:
Which modification enables the code fragment to print Speaker?
- A. Replace line n1 with:public static boolean isAvailable (Product p) {
- B. Replace line n2 with:.filter (p -> Product: :ProductFilter: :isAvailable ())
- C. Implement Predicate in the Product.ProductFilter class and replace line n2 with .filter (p -> p.ProductFilter.test (p))
- D. Replace line n2 with:.filter (p -> p.ProductFilter: :isAvailable (p))
Answer: A
NEW QUESTION 106
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 fName and then ascending order of lName?
- A. .map(Emp::getfName).sorted(Comparator.reserveOrder())
- B. .sorted (Comparator.comparing(Emp::getfName).reserved().thenComparing(Emp::getlName))
- C. .sorted (Comparator.comparing(Emp::getfName).thenComparing(Emp::getlName))
- D. .map(Emp::getfName).sorted(Comparator.reserveOrder().map(Emp::getlName).reserved
Answer: B
NEW QUESTION 107
Given the definition of the Emp class:
public class Emp
private String eName;
private Integer eAge;
Emp(String eN, Integer eA) {
this.eName = eN;
this.eAge = eA;
}
public Integer getEAge () {return eAge;}
public String getEName () {return eName;}
}
and code fragment:
List<Emp>li = Arrays.asList(new Emp("Sam", 20), New Emp("John", 60), New Emp("Jim",
51));
Predicate<Emp> agVal = s -> s.getEAge() > 50;//line n1
li = li.stream().filter(agVal).collect(Collectors.toList());
Stream<String> names = li.stream()map.(Emp::getEName);//line n2
names.forEach(n -> System.out.print(n + " "));
What is the result?
- A. A compilation error occurs at line n2.
- B. A compilation error occurs at line n1.
- C. Sam John Jim
- D. John Jim
Answer: C
NEW QUESTION 108
Given:
public class Canvas implements Drawable {
public void draw () { }
}
public abstract class Board extends Canvas { }
public class Paper extends Canvas {
protected void draw (int color) { }
}
public class Frame extends Canvas implements Drawable {
public void resize () { }
abstract void open ();
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?
- A. Frame does not compile.
- B. All classes compile successfully.
- C. Drawable does not compile.
- D. Board does not compile.
- E. Paper does not compile.
Answer: A
NEW QUESTION 109
Given:
public class Counter {
public static void main (String[ ] args) {
int a = 10;
int b = -1;
assert (b >=1) : "Invalid Denominator";
int = a / b;
System.out.println (c);
}
}
What is the result of running the code with the -ea option?
- A. 0
- B. An AssertionError is thrown.
- C. A compilation error occurs.
- D. 1
Answer: A
NEW QUESTION 110
Given:
and the code fragment:
What is the result?
- A. true
true - B. false
true - C. true
false - D. false
false
Answer: B
NEW QUESTION 111
Given the code fragment:
What is the result?
- A. A nullPointerException is thrown at runtime.
- B. Match 1
- C. Match 2
- D. No Match
Answer: C
NEW QUESTION 112
Which statement is true about the DriverManager class?
- A. It returns an instance of Connection.
- B. it is written by different vendors for their specific database.
- C. It executes SQL statements against the database.
- D. It only queries metadata of the database.
Answer: A
Explanation:
Explanation
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the underlying driver connection (which is often a PDO instance).
References:
NEW QUESTION 113
Given:
and the code fragment:
What is the result?
[Java EE: Helen:Houston]
- A. Java ME
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] - B. A compilation error occurs.
- C. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
Java EE - D. [Java EE: Helen:Houston]
Answer: B
Explanation:
NEW QUESTION 114
Given:
What change should you make to guarantee a single order of execution (printed values 1 -100 in order)?
- A. Line 2: public volatile int value;
- B. Line 2: public synchronized int value;
- C. Line 3: public synchronized void run() {
- D. Line 1: class MyClass extends Thread {
Answer: D
NEW QUESTION 115
Given the code fragment:
9.Connection conn = DriveManager.getConnection(dbURL, userName, passWord);
10.
String query = "SELECT id FROM Employee";
11.
try (Statement stmt = conn.createStatement()) {
12.
ResultSet rs = stmt.executeQuery(query); 13.stmt.executeQuery("SELECT id FROM Customer");
14.
while (rs.next()) {
15.
//process the results 16.System.out.println("Employee ID: "+ rs.getInt("id")); 17.}
18.
} catch (Exception e) {
19.
System.out.println ("Error");
20.
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The Employee and Customer tables are available and each table has id column with a few
records and the SQL queries are valid.
What is the result of compiling and executing this code fragment?
- A. The program prints Error.
- B. The program prints employee IDs.
- C. The program prints customer IDs.
- D. compilation fails on line 13.
Answer: D
NEW QUESTION 116
Given the fragments:
Which line causes a compilation error?
- A. Line n3
- B. Line n1
- C. Line n2
- D. Line n4
Answer: B
NEW QUESTION 117
Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1to start r1and c1 threads?
- A. es.submit(r1);
Future<String> f1 = es.submit (c1); - B. Future<String> f1 = (Future<String>) es.execute(r1);
Future<String> f2 = (Future<String>) es.execute(c1); - C. es.execute (r1);
Future<String> f1 = es.execute (c1) ; - D. Future<String> f1 = (Future<String>) es.submit (r1);
es.execute (c1);
Answer: A
NEW QUESTION 118
Given the code fragment:
What is the result?
- A. Found Default
- B. Found Red Found Default
- C. Found Teal
- D. Found Red Found Blue Found Teal
- E. Found Red Found Blue Found Teal Found Default
Answer: C
NEW QUESTION 119
Given:
and
Which interface from the java.util.functionpackage should you use to refactor the class Txt?
- A. Predicate
- B. Function
- C. Consumer
- D. Supplier
Answer: D
Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/function/package-summary.html
NEW QUESTION 120
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 n2.
- C. A compilation error occurs at line n1.
- D. 0
Answer: C
NEW QUESTION 121
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 Jackand the program prints:112 Jerry
- C. The Employee table is not updated and the program prints:112 Jerry
- D. The Employee table is updated with the row:112 Jackand the program prints:112 Jack
Answer: C
NEW QUESTION 122
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 < 0: System.exit(0);
- B. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- C. assert (fuelLevel) : "Terminating...";
- D. assert fuelLevel > 0: "Impossible fuel" ;
Answer: A
NEW QUESTION 123
Given:
class RateOfInterest {
public static void main (String[] args) {
int rateOfInterest = 0;
String accountType = "LOAN";
switch (accountType) {
case "RD";
rateOfInterest = 5;
break;
case "FD";
rateOfInterest = 10;
break;
default:
assert false: "No interest for this account"; //line n1
}
System.out.println ("Rate of interest:" + rateOfInterest);
}
}
and the command:
java -ea RateOfInterest
What is the result?
- A. A compilation error occurs at line n1.
- B. An AssertionError is thrown.
- C. Rate of interest: 0
- D. No interest for this account
Answer: D
NEW QUESTION 124
Given:
What is the result?
Bar Hello
- A. Baz Hello
Baz Hello - B.
- C. Foo Hello
Bar Hello - D. A compilation error occurs in the Dazeclass.
Answer: A
NEW QUESTION 125
......
Oracle Certified 1z0-809 Dumps Questions Valid 1z0-809 Materials: https://www.testsdumps.com/1z0-809_real-exam-dumps.html
Current 1z0-809 Exam Dumps [2022] Complete Oracle Exam Smoothly: https://drive.google.com/open?id=1ljn5Z-4L5FxO-dflCHsNOucDH8fo1HgG
