Authentic Oracle 1z1-809 Exam Dumps PDF - 2025 Updated
Get Prepared for Your 1z1-809 Exam With Actual 209 Questions
Obtaining the Oracle 1z0-809 certification can be a valuable asset for Java developers looking to advance their careers. It demonstrates their proficiency in advanced Java programming concepts and sets them apart from other candidates in a highly competitive job market.
To prepare for the Oracle 1z1-809 exam, candidates can take advantage of various study resources. Oracle offers official study guides, training courses, and practice exams that can help candidates to prepare for the exam. In addition, there are many online forums and study groups where candidates can discuss exam topics and share study materials.
Oracle 1z0-809 is a widely recognized certification exam for professionals seeking to enhance their career opportunities in the field of Java programming. It is designed to validate the knowledge and skills of candidates in advanced Java programming concepts, including object-oriented programming, concurrency, and functional programming. 1z1-809 exam is intended for professionals who have already earned the Oracle Certified Associate (OCA) certification, and are looking to advance their expertise in Java programming.
NEW QUESTION # 32
Given the code fragment:
Which code fragment prints blue, cyan, ?
- A. Option C
- B. Option D
- C. Option B
- D. Option A
Answer: D
NEW QUESTION # 33
Given the code fragment:
Assume that the value of now is 6:30 in the morning.
What is the result?
- A. c1
- B. 0
- C. 1
- D. An exception is thrown at run time.
Answer: B
Explanation:
Explanation
NEW QUESTION # 34
Given the code fragment:
List<String> empDetails = Arrays.asList("100, Robin, HR",
"200, Mary, AdminServices",
"101, Peter, HR");
empDetails.stream()
.filter(s-> s.contains("1"))
.sorted()
.forEach(System.out::println); //line n1
What is the result?
- A. 100, Robin, HR200, Mary, AdminServices101, Peter, HR
- B. 100, Robin, HR101, Peter, HR
- C. 100, Robin, HR101, Peter, HR200, Mary, AdminServices
- D. E. A compilation error occurs at line n1.
Answer: B
NEW QUESTION # 35
Given:
What is the result?
- A. false, false
- B. true, true
- C. true, false
- D. false, true
Answer: D
NEW QUESTION # 36
Given the code fragment:
What is the result?
- A. 1 3
followed by an ArrayIndexOutOfBoundsException - B. 1 3
1 3 0 0 - C. 1 3
1 3 - D. 1 3 5 7
1 3 - E. Compilation fails.
Answer: D
NEW QUESTION # 37
Which statement is true about java.util.stream.Stream?
- A. A parallel stream is always faster than an equivalent sequential stream.
- B. The execution mode of streams can be changed during processing.
- C. A stream cannot be consumed more than once.
- D. Streams are intended to modify the source data.
Answer: C
NEW QUESTION # 38
Given:
What is the result?
- A. Hi Interface-1
- B. A compilation error occurs.
- C. Hi Interface-2
- D. Hi MyClass
Answer: D
NEW QUESTION # 39
Given:
Your design requires that:
* fuelLevel of Engine must be greater than zero when the start() method is invoked.
* The code must terminate if fuelLevel of Engine is less than or equal to zero.
Which code fragment should be added at line n1 to 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 # 40
Given:
And given the commands:
What is the result?
- A. true true
- B. A ClassCastException is thrown at runtime.
- C. TRUE null
- D. true false
- E. false false
Answer: D
NEW QUESTION # 41
Given:
Which option fails?
- A. Foo<String, String> grade = new Foo <> ("John", "A");
- B. Foo<String, Integer> mark = new Foo<Object, Object> ("Steve", 100);
- C. Foo<Object, Object> percentage = new Foo<Object, Object>("Steve", 100);
- D. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
Answer: C
NEW QUESTION # 42
Given the code fragment:
You have been asked to define the ProductCode class. The definition of the ProductCode class must allow c1 instantiation to succeed and cause a compilation error on c2 instantiation.
Which definition of ProductCode meets the requirement?
- A.
- B.
- C.
- D.
Answer: B
NEW QUESTION # 43
Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
- A. Class C implements Y extends B { }
- B. Class C extends A implements X { }
- C. Class C extends B implements X, Y { }
- D. Class C extends A, B { }
- E. Class C implements X, Y extends B { }
Answer: B,C
NEW QUESTION # 44
Given:
What is the result?
- A. Initialized
Started - B. Initialized
Started
Initialized - C. Compilation fails
- D. An exception is thrown at runtime
Answer: C
NEW QUESTION # 45
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. [Beginning with Java:2, A Guide to Java Tour:3]
- B. A compilation error occurs because the Book class does not override the abstract method compareTo().
- C. [A Guide to Java Tour:3, Beginning with Java:2]
- D. An Exception is thrown at run time.
Answer: C
NEW QUESTION # 46
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, “A”);
books.put (1002, “C”);
books.put (1001, “B”);
books.put (1003, “B”);
System.out.println (books);
What is the result?
- A. {1002 = C, 1003 = B, 1007 = A}
- B. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- C. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
- D. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
Answer: D
Explanation:
Explanation/Reference:
Reference: TreeMap inherits SortedMap and automatically sorts the element's key
NEW QUESTION # 47
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 (Supplier<Bird> bird) {
bird.get( ) fly ();
} - B. static void fly (Consumer<? extends Bird> bird) { bird.accept( ) fly ();
} - C. static void fly (Consumer<Bird> bird) {
bird :: fly ();
} - D. static void fly (Supplier<? extends Bird> bird) { LOST
Answer: A
Explanation:
Very confusing question. There is no logic in the options.
NEW QUESTION # 48
Given the code fragments :
and
What is the result?
- A. TV Price :110 Refrigerator Price :2100
- B. TV Price :1000 Refrigerator Price :2000
- C. A compilation error occurs.
- D. The program prints nothing.
Answer: A
NEW QUESTION # 49
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?
- A. Stream<Path> stream = Files.find (Paths.get ("customers.txt"));stream.forEach( c) -> System.out.println(c));
- B. Stream<String> stream = Files.find (Paths.get ("customers.txt"));stream.forEach((String c) -> System.out.println(c));
- C. Stream<Path> stream = Files.list (Paths.get ("customers.txt"));stream.forEach( c) -> System.out.println(c));
- D. Stream<String> lines = Files.lines (Paths.get ("customers.txt"));lines.forEach( c) -> System.out.println(c));
Answer: D
NEW QUESTION # 50
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 Jackand the program prints:112 Jerry
- 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 Jackand the program prints:112 Jack
Answer: B
NEW QUESTION # 51
Given:
public class Foo<K, V> {
private K key;
private V value;
public Foo (K key, V value) (this.key = key; this value = value;)
public static <T> Foo<T, T> twice (T value) (return new Foo<T, T> (value, value); )
public K getKey () (return key;)
public V getValue () (return value;)
}
Which option fails?
- A. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100););
- B. Foo<String, String> grade = new Foo <> ("John", "A");
- C. Foo<?, ?> percentage = new Foo <> (97, 32););
- D. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
Answer: C
NEW QUESTION # 52
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n2.
- B. A compilation error occurs at line n1.
- C. Checking...
- D. Checking...Checking...
Answer: B
NEW QUESTION # 53
Which two methods from the java.util.stream.Streaminterface perform a reduction operation? (Choose two.)
- A. peek ()
- B. count ()
- C. distinct ()
- D. filter ()
- E. collect ()
Answer: B,E
Explanation:
Explanation/Reference: https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html
NEW QUESTION # 54
Given:
public class Customer {
private String fName;
private String lName;
private static int count;
public customer (String first, String last) {fName = first, lName = last;
+ +count;}
static { count = 0; }
public static int getCount() {return count; }
}
public class App {
public static void main (String [] args) {
Customer c1 = new Customer("Larry", "Smith");
Customer c2 = new Customer("Pedro", "Gonzales");
Customer c3 = new Customer("Penny", "Jones");
Customer c4 = new Customer("Lars", "Svenson");
c4 = null;
c3 = c2;
System.out.println (Customer.getCount());
}
}
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: D
NEW QUESTION # 55
Given the code fragment:
What is the result?
Word: why what when
- A. Compilation fails at line n1.
- B.
- C. Word: why Word: what Word: when
- D. Word: why Word: why what Word: why what when
Answer: D
Explanation:
Explanation
NEW QUESTION # 56
Given that data.txt and alldata.txt are accessible, and the code fragment:
What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?
- A. br.flush();
- B. bw.writeln();
- C. bw.flush();
- D. br.close();
Answer: C
NEW QUESTION # 57
......
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