Latest 1z0-809 exam dumps with real Oracle questions and answers
1z0-809 Exam in First Attempt Guaranteed
Oracle 1z0-809 certification exam is intended for experienced Java developers who have at least one year of experience in Java programming language. Candidates for 1z0-809 exam should have a good understanding of core Java concepts, object-oriented programming, and Java SE 8 APIs. Additionally, candidates should have experience in writing Java applications that use streams, lambda expressions, and concurrency features.
NEW QUESTION # 96
Given:
public class Counter {
public static void main (String[ ] args) {
int a = 10;
int b = -1;
assert (b >=1) : "Invalid Denominator";
int с = a / b;
System.out.println (c);
}
}
What is the result of running the code with the -eaoption?
- A. An AssertionErroris thrown.
- B. 0
- C. A compilation error occurs.
- D. 1
Answer: D
NEW QUESTION # 97
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. java
public class ProductCode {
private String code;
public ProductCode(String code) {
if (code == null) {
throw new IllegalArgumentException("Code cannot be null");
}
this.code = code;
}
} - B. java
public class ProductCode {
private String code;
public ProductCode() {
this.code = "default";
}
} - C. java
public class ProductCode {
private String code;
private ProductCode(String code) {
this.code = code;
}
} - D. java
public class ProductCode {
private String code;
public ProductCode(String code) {
this.code = code;
}
}
Answer: C
NEW QUESTION # 98
Which statement is true about the DriverManager class?
- A. It only queries metadata of the database.
- B. It returns an instance of Connection.
- C. it is written by different vendors for their specific database.
- D. it executes SQL statements against the database.
Answer: B
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). Reference: http://doctrine-dbal.readthedocs.org/en/latest/reference/configuration.html
NEW QUESTION # 99
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 (o2); } } ); treeMap.putAll (unsortMap); for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) { System.out.print (entry.getValue () + " ");
}
}
}
What is the result?
- A. d b e z j
- B. A compilation error occurs.
- C. j z e b d
- D. z b d e j
Answer: D
NEW QUESTION # 100
Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path1.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?
- A. /app/./sys/log
/ readme - B. /app/sys/log
/readme/server/exe - C. /app/log/sys
/ server/exe/readme - D. /app/./sys/log
/ server/exe/readme
Answer: D
NEW QUESTION # 101
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
- A. ToIntFunction<Integer> funRef = e -> e + 10;
int result = funRef.applyAsInt (value); - B. IntFunction funRef = e -> e + 10;
Integer result = funRef.apply (10); - C. ToIntFunction funRef = e -> e + 10;
int result = funRef.apply (value); - D. Function<Integer> funRef = e -> e + 10;
Integer result = funRef.apply(value);
Answer: D
NEW QUESTION # 102
Given the code fragment:
Which modification enables the code to print Price 5 New Price 4?
- A. Replace line n1with .forEach (e -> System.out.print ("Price" + e))
- B. Replace line n2with .map (n -> System.out.println ("New Price" + n -1))and
remove line n3 - C. Replace line n2 with .mapToInt (n -> n - 1);
- D. Replace line n3with .forEach (n -> System.out.println ("New Price" + n));
Answer: D
NEW QUESTION # 103
Given the content of /resourses/Message.properties:
welcome1="Good day!"
and given the code fragment:
Properties prop = new Properties ();
FileInputStream fis = new FileInputStream ("/resources/Message.properties"); prop.load(fis); System.out.println(prop.getProperty("welcome1")); System.out.println(prop.getProperty("welcome2", "Test"));//line n1 System.out.println(prop.getProperty("welcome3")); What is the result?
- A. A compilation error occurs at line n1.
- B. Good day!
Test
null - C. Good day!
followed by an Exception stack trace - D. Good day!
Test
followed by an Exception stack trace
Answer: A
NEW QUESTION # 104
Given: What is the result?
- A. Compilation fails due to an error at line n2
- B. Compilation fails due to an error in line n1
- C. 100 210
- D. Compilation fails due to an error at line n3
Answer: A
NEW QUESTION # 105
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, String> pair = Foo.<String>twice ("Hello World!");
- B. Foo<String, String> grade = new Foo <> ("John", "A");
- C. Foo<?, ?> percentage = new Foo <> (97, 32);
- D. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
Answer: C
NEW QUESTION # 106
Which two statements are true about synchronization and locks? (Choose two.)
- A. Threads cannot acquire intrinsic locks on classes.
- B. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
- C. A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the
time it releases it. - D. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an
uncaught exception. - E. A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that
method.
Answer: B,D
NEW QUESTION # 107
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
public String getCourse() {return course;}
public String getName() {return name;}
public String getCity() {return city;}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
.collect(Collectors.groupingBy(Student::getCourse))
.forEach(src, res) -> System.out.println(res));
What is the result?
- A. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago][Java EE: Helen:Houston]
- B. [Java EE: Helen:Houston][Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
- C. Java EEJava ME
- D. A compilation error occurs.
Answer: C
NEW QUESTION # 108
Given:
And given the code fragment:
What is the result?
- A. 10:20
- B. Compilation fails at line n2.
- C. Compilation fails at line n1.
- D. 0:20
Answer: B
NEW QUESTION # 109
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 # 110
Given:
What is the result?
Bar Hello
- A. Baz Hello
Baz Hello - B. A compilation error occurs in the Dazeclass.
- C.
- D. Foo Hello
Bar Hello
Answer: A
NEW QUESTION # 111
Given: What is the result?
- A. First Exception Done
- B. Done Third Exception
- C. 0 Done
- D. Second Exception
- E. Third Exception
Answer: A
NEW QUESTION # 112
......
Oracle 1z1-809 certification exam has a duration of 150 minutes and consists of 85 multiple-choice questions. 1z0-809 exam covers a wide range of topics, including Java Class Design, Advanced Java Class Design, Generics and Collections, Lambda Built-in Functional Interfaces, Java Stream API, Exceptions and Assertions, Java I/O Fundamentals, Java File I/O, Java Concurrency, Building Database Applications with JDBC, Localization, and Annotations.
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