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NEW QUESTION # 106
You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?
- A. Implement the Serializable interface.
- B. Use a static reference to point to the single instance.
- C. Make the class static.
- D. Make the constructor private.
- E. Override equals() and hashCode() methods of the java.lang.Object class.
Answer: B,D
NEW QUESTION # 107
Given the code fragment:
Path source = Paths.get ("/data/december/log.txt");
Path destination = Paths.get("/data");
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and
contains:
10-Dec-2014 ?Executed successfully
What is the result?
- A. A file with the name log.txt is created in the /data directory and the content of the
/data/december/log.txt file is copied to it. - B. A FileNotFoundException is thrown at run time.
- C. A FileAlreadyExistsException is thrown at run time.
- D. The program executes successfully and does NOT change the file system.
Answer: C
NEW QUESTION # 108
Given that these files exist and are accessible:
and given the code fragment:
Which code fragment can be inserted at line n1 to enable the code to print only /company/emp?
- A. Stream<Path> stream = Files.list (Paths.get ("/company/emp"));
- B. Stream<Path> stream = Files.find(
Paths.get ("/company"), 1,
(p,b) -> b.isDirectory (), FileVisitOption.FOLLOW_LINKS); - C. Stream<Path> stream = Files.walk (Paths.get ("/company"));
- D. Stream<Path> stream = Files.list (Paths.get ("/company"));
Answer: B
NEW QUESTION # 109
Given the code fragment:
What is the result?
- A. An IndexOutOfBoundsException is thrown at runtime.
- B. [green, red, yellow, cyan]
- C. (green, red, cyan, yellow)
- D. [green, blue, yellow, cyan]
Answer: B
NEW QUESTION # 110
Given:
class FuelNotAvailException extends Exception { }
class Vehicle {
void ride() throws FuelNotAvailException {//line n1
System.out.println("Happy Journey!");
}
}
class SolarVehicle extends Vehicle {
public void ride () throws Exception {//line n2
super ride ();
}
}
and the code fragment:
public static void main (String[] args) throws FuelNotAvailException,
Exception {
Vehicle v = new SolarVehicle ();
v.ride();
}
Which modification enables the code fragment to print Happy Journey!?
- A. Replace line n1 with protected void ride() throws Exception {
- B. Replace line n2 with private void ride() throws FuelNotAvailException {
- C. Replace line n1 with public void ride() throws FuelNotAvailException {
- D. Replace line n2 with void ride() throws Exception {
Answer: A
NEW QUESTION # 111
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. Stream<String> fc = Files.readAllLines (file); fc.forEach (s - > System.out.println(s));
- B. List<String> fc = Files.list(file);
fc.stream().forEach (s - > System.out.println(s)); - C. List<String> fc = readAllLines(file);
fc.stream().forEach (s - > System.out.println(s)); - D. Stream<String> fc = Files.lines (file);
fc.forEach (s - > System.out.println(s));
Answer: D
NEW QUESTION # 112
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, HR
101, Peter, HR
200, Mary, AdminServices - B. A compilation error occurs at line n1.
- C. 100, Robin, HR
200, Mary, AdminServices
101, Peter, HR - D. 100, Robin, HR
101, Peter, HR
Answer: A
NEW QUESTION # 113
Given the code fragment:
What is the result?
- A. Compilation fails at line n1.
- B. A ClassCastException is thrown at line n1.
- C. Sum is 600
- D. Compilation fails at line n2.
- E. A ClassCastException is thrown at line n2.
Answer: E
NEW QUESTION # 114
Given that version.txt is accessible and contains:
1234567890
and given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. The program prints nothing.
Answer: B
NEW QUESTION # 115
Given:
Which two interfaces can you use to create lambda expressions? (Choose two.)
- A. P
- B. R
- C. Q
- D. S
- E. T
- F. U
Answer: A,D
NEW QUESTION # 116
Given the code fragment:
Which two code fragments, when inserted at line n1 independently, result in the output PEEK: Unix?
- A. .allMatch ();
- B. .noneMatch ();
- C. .findFirst ();
- D. .anyMatch ();
- E. .findAny ();
Answer: C
NEW QUESTION # 117
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/log/sys
/ server/exe/readme - C. /app/sys/log
/readme/server/exe - D. /app/./sys/log
/ server/exe/readme
Answer: D
NEW QUESTION # 118
Given the code fragment:
public static void main (String[] args) throws IOException {
BufferedReader brCopy = null;
try (BufferedReader br = new BufferedReader (new FileReader("employee.txt"))) { // line n1 br.lines().forEach(c -> System.out.println(c)); brCopy = br;//line n2
}
brCopy.ready(); //line n3;
}
Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an exception, and employee.txt is accessible and contains valid text.
What is the result?
- A. A compilation error occurs at line n3.
- B. The code prints the content of the employee.txt file and throws an exception at line n3.
- C. A compilation error occurs at line n2.
- D. A compilation error occurs at line n1.
Answer: D
NEW QUESTION # 119
Which statement is true about the single abstract method of the java.util.function.Function interface?
- A. It accepts one argument and always produces a result of the same type as the argument.
- B. It accepts one argument and returns boolean.
- C. It accepts one argument and returns void.
- D. It accepts an argument and produces a result of any data type.
Answer: D
Explanation:
http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)
NEW QUESTION # 120
Given:
What is the result?
- A. 6 7 8
- B. 0 1 2
- C. 6 8 10
- D. 7 8 9
- E. Compilation fails
Answer: A
NEW QUESTION # 121
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 employee IDs.
- B. The program prints Error.
- C. compilation fails on line 13.
- D. The program prints customer IDs.
Answer: B
NEW QUESTION # 122
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. AnArrayIndexOutOfBoundsException is thrown at runtime
- D. 2
- E. Compilation fails
Answer: B
NEW QUESTION # 123
Given the code fragment:
public static void main (String [ ] args) throws IOException {
BufferedReader br = new BufferedReader (new InputStremReader (System.in));
System.out.print ("Enter GDP: ");
/ /line 1
}
Which code fragment, when inserted at line 1, enables the code to read the GDP from the user?
- A. int GDP = Integer.parseInt (br.readline());
- B. int GDP = br.nextInt();
- C. int GDP = Integer.parseInt (br.next());
- D. int GDP = br.read();
Answer: A
NEW QUESTION # 124
Given:
and the code fragment:
Assuming candlist contains Candidate objects, which code fragment calculates the average age of candidates from NewYork?
- A.
- B.
- C.
- D.
Answer: D
NEW QUESTION # 125
Given the code fragments:
and
What is the result?
- A. [Dog, Cat, Mouse]
- B. DogCatMouse
- C. null
- D. A compilation error occurs.
Answer: A
NEW QUESTION # 126
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION # 127
Given the code fragment:
Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?
- A. BiConsumer<Integer, Integer, Integer> c = (i, j) -> {System.out.print (i + ","
+ j+ "; ");}; - B. BiConsumer<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
- C. BiFunction<Integer, Integer, String> c = (i, j) -> {System.out.print (i + "," + j+ "; ")};
- D. BiConsumer<Integer,Integer> c = (i, j) -> {System.out.print (i + "," + j+ ";
");};
Answer: C
NEW QUESTION # 128
......
Oracle 1z1-809 (Java SE 8 Programmer II) Certification Exam is a comprehensive exam that tests a candidate's knowledge of Java programming. 1z1-809 exam is designed for experienced Java developers who have already passed the Oracle Certified Associate (OCA) exam and have a solid understanding of the Java programming language. 1z1-809 exam covers a wide range of topics, including advanced Java concepts, database connectivity, and security.
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