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Genuine Oracle 1Z0-809 practice test [Q1-Q13 free] which helps you to understand in-depth
QUESTION 1
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
A. Function funRef = e –andgt; e + 10; Integer result = funRef.apply(value);
B. IntFunction funRef = e –andgt; e + 10; Integer result = funRef.apply (10);
C. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.applyAsInt (value);
D. ToIntFunction funRef = e –andgt; e + 10; int result = funRef.apply (value);
Correct Answer: A
QUESTION 2
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
D. assert fuelLevel > 0: “Impossible fuel” ;
Correct Answer: C
QUESTION 3
Given the content of Operator.java, EngineOperator.java, and Engine.java files: and the code fragment:
What is the result?
A. The Engine.java file fails to compile.
B. The EngineOperator.java file fails to compile.
C. The Operator.java file fails to compile.
D. ON OFF
Correct Answer: A
QUESTION 4
Given the code fragments:
class Employee {
Optional address;
Employee (Optional address) {
this.address = address;
}
public Optional getAddress() { return address; }
}
class Address {
String city = “New York”;
public String getCity { return city: }
public String toString() {
return city;
}
}
and
Address address = new Address;
Optional addrs1 = Optional.ofNullable (address);
Employee e1 = new Employee (addrs1);
String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : “City Not available”;
System.out.println(eAddress);
What is the result?
A. New York
B. City Not available
C. null
D. A NoSuchElementException is thrown at run time.
Correct Answer: C
QUESTION 5
For which three objects must a vendor provide implementations in its JDBC driver? (Choose three.)
A. Time
B. Date
C. Statement
D. ResultSet
E. Connection
F. SQLException
G. DriverManager
Correct Answer: CDE
Database vendors support JDBC through the JDBC driver interface or through the ODBC connection. Each driver must
provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement,
java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by
the generic java.sql.DriverManager interface.
QUESTION 6
Given the code fragment:
What is the result?
A. A compilation error occurs at line n1.
B. Checking…
C. Checking… Checking…
D. A compilation error occurs at line n2.
Correct Answer: A
QUESTION 7
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 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(scr));
What is the result?
A. A compilation error occurs.
B. Java EE Java ME
C. [Java EE: Helen:Houston] [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
D. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago] [Java EE: Helen:Houston]
Correct Answer: B
QUESTION 8
Given the code fragments: and
What is the result?
A. Video played.Game played.
B. A compilation error occurs.
C. class java.lang.Exception
D. class java.io.IOException
Correct Answer: C
QUESTION 9
Given the code fragment:
Stream files = Files.walk(Paths.get(System.getProperty(“user.home”)));
files.forEach (fName -> { //line n1
try {
Path aPath = fName.toAbsolutePath(); //line n2
System.out.println(fName + “:”
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime
());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?
A. All files and directories under the home directory are listed along with their attributes.
B. A compilation error occurs at line n1.
C. The files in the home directory are listed along with their attributes.
D. A compilation error occurs at line n2.
Correct Answer: A
QUESTION 10
Given the code fragments:
What is the result?
A. France Optional[NotFound]
B. Optional [France] Optional [NotFound]
C. Optional[France] Not Found
D. France Not Found
Correct Answer: D
QUESTION 11
Given the code fragment:
Path file = Paths.get (“courses.txt”); // line n1
Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?
A. List fc = Files.list(file); fc.stream().forEach (s – > System.out.println(s));
B. Stream fc = Files.readAllLines (file); fc.forEach (s – > System.out.println(s));
C. List fc = readAllLines(file); fc.stream().forEach (s – > System.out.println(s));
D. Stream fc = Files.lines (file); fc.forEach (s – > System.out.println(s));
Correct Answer: D
QUESTION 12
Given the content:
What is the result?
A. username = Entrez le nom d\\’utilisateur password = Entrez le mot de passe
B. username = Enter User Name password = Enter Password
C. A compilation error occurs.
D. The program prints nothing.
Correct Answer: A
QUESTION 13
Given the code fragment:
List 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, HR 101, Peter, HR
B. A compilation error occurs at line n1.
C. 100, Robin, HR 101, Peter, HR 200, Mary, AdminServices
D. 100, Robin, HR 200, Mary, AdminServices 101, Peter, HR
Correct Answer: A
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