Real 1z0-809 Exam PDF Test Engine Practice Test Questions
Oracle 1z0-809 Real 2023 Braindumps Mock Exam Dumps
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NEW QUESTION # 57
Given that /green.txtand /colors/yellow.txtare accessible, and the code fragment:
Path source = Paths.get("/green.txt);
Path target = Paths.get("/colors/yellow.txt);
Files.move(source, target, StandardCopyOption.ATOMIC_MOVE);
Files.delete(source);
Which statement is true?
- A. A FileAlreadyExistsExceptionis thrown at runtime.
- B. The green.txtfile content is replaced by the yellow.txtfile content and the yellow.txtfile is deleted.
- C. The file green.txtis moved to the /colorsdirectory.
- D. The yellow.txtfile content is replaced by the green.txtfile content and an exception is thrown.
Answer: A
NEW QUESTION # 58
Given the code fragment:
List<String> colors = Arrays.asList("red", "green", "yellow");
Predicate<String> test = n - > {
System.out.println("Searching...");
return n.contains("red");
};
colors.stream()
.filter(c -> c.length() > 3)
.allMatch(test);
What is the result?
- A. A compilation error occurs.
- B. Searching...
- C. Searching... Searching... Searching...
- D. Searching... Searching...
Answer: A
NEW QUESTION # 59
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");)
public void run(Integer distance);
}
Which statement is true?
- A. Movable cannot be used in a lambda expression.
- B. Moveable can be used as below:Moveable<Integer> animal = n - > System.out.println("Running" +
n);animal.run(100);animal.walk(20); - C. Moveable can be used as below:Moveable<Integer> animal = n - > n +
10;animal.run(100);animal.walk(20); - D. Moveable can be used as below:Moveable animal = (Integer n) - >
System.out.println(n);animal.run(100);Moveable.walk(20);
Answer: B
NEW QUESTION # 60
Given the code fragments:
and
What is the result?
- A. A compilation error occurs.
- B. [Dog, Cat, Mouse]
- C. DogCatMouse
- D. null
Answer: B
NEW QUESTION # 61
Given the code fragment:
Which is the valid definition of the Course enum?
- A.
- B.
- C.
- D.
Answer: B
NEW QUESTION # 62
Which statement is true about the DriverManagerclass?
- A. it is written by different vendors for their specific database.
- B. it executes SQL statements against the database.
- C. It returns an instance of Connection.
- D. It only queries metadata of the database.
Answer: C
Explanation:
Explanation/Reference:
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 # 63
Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (".class"))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files
and is passed as an argument to the recDelete () method when it is
invoked.
What is the result?
- A. The method throws an IOException.
- B. The method deletes all the .class files in the Projects directory and its subdirectories.
- C. The method deletes the .class files of the Projects directory only.
- D. The method executes and does not make any changes to the Projects directory.
Answer: B
NEW QUESTION # 64
Given the definition of the Empclass:
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 n1.
- B. Sam John Jim
- C. A compilation error occurs at line n2.
- D. John Jim
Answer: B
NEW QUESTION # 65
Given:
and the command:
java Product 0
What is the result?
- A. A compilation error occurs at line n1.
- B. New Price: 0.0
- C. An AssertionError is thrown.
- D. A NumberFormatException is thrown at run time.
Answer: D
NEW QUESTION # 66
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 n1 to start r1 and c1 threads?
- A. es.submit(r1);Future<String> f1 = es.submit (c1);
- B. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
- C. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>) es.execute(c1);
- D. es.execute (r1);Future<String> f1 = es.execute (c1) ;
Answer: A
NEW QUESTION # 67
Given the code fragment:
9 . Connection conn = DriveManager.getConnection(dbURL, userName, passWord);
1 0. String query = "SELECT id FROM Employee";
1 1. try (Statement stmt = conn.createStatement()) {
1 2. ResultSet rs = stmt.executeQuery(query);
1 3. stmt.executeQuery("SELECT id FROM Customer");
1 4. while (rs.next()) {
1 5. //process the results
1 6. System.out.println("Employee ID: "+ rs.getInt("id"));
1 7. }
1 8. } catch (Exception e) {
1 9. System.out.println ("Error");
2 0. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWordexists.
The Employeeand Customertables 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 customer IDs.
- B. compilation fails on line 13.
- C. The program prints employee IDs.
- D. The program prints Error.
Answer: B
NEW QUESTION # 68
Given the following classes:
And given the following main method:
Which two options fail to compile when placed at line n1 of the main method?
- A. director .salary = 80_000;
- B. manager .budget = 1_000_000;
- C. manager .stockoption = 500;
- D. employee .salary = 50_000;
- E. employee .budget = 200_000;
- F. director .stockoptions = 1_000;
Answer: C,E
NEW QUESTION # 69
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: A
NEW QUESTION # 70
Which statement is true about the DriverManager class?
- A. it is written by different vendors for their specific database.
- B. it executes SQL statements against the database.
- C. It returns an instance of Connection.
- D. It only queries metadata of the database.
Answer: C
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).
http://doctrine-dbal.readthedocs.org/en/latest/reference/configuration.html
NEW QUESTION # 71
Which three are advantages of the Java exception mechanism?
- A. allows the creation of new exceptions that are tailored to the particular program being created
- B. improves the program structure because exceptions must be handled in the method in which they occurred
- C. improves the program structure because the error handling code is separated from the normal program function
- D. improves the program structure because the programmer can choose where to handle exceptions
- E. provides a set of standard exceptions that Covers all the possible errors
Answer: A,C,D
NEW QUESTION # 72
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 () { }
}
public interface Drawable {
public abstract void draw ();
}
Which statement is true?
- A. Frame does not compile.
- B. Board does not compile.
- C. All classes compile successfully.
- D. Drawable does not compile.
- E. Paper does not compile.
Answer: E
NEW QUESTION # 73
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 Jack
and the program prints:
112 Jerry - B. The program prints Exception is raised.
- C. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jack - D. The Employee table is not updated and the program prints:
112 Jerry
Answer: B
NEW QUESTION # 74
Given the code fragments:
class Caller implements Callable<String> {
String str;
public Caller (String s) {this.str=s;}
public String call()throws Exception { return str.concat ("Caller");}
}
class Runner implements Runnable {
String str;
public Runner (String s) {this.str=s;}
public void run () { System.out.println (str.concat ("Runner"));}
}
and
public static void main (String[] args) InterruptedException, ExecutionException {
ExecutorService es = Executors.newFixedThreadPool(2);
Future f1 = es.submit (new Caller ("Call"));
Future f2 = es.submit (new Runner ("Run"));
String str1 = (String) f1.get();
String str2 = (String) f2.get();//line n1
System.out.println(str1+ ":" + str2);
}
What is the result?
- A. A compilation error occurs at line n1.
- B. The program prints:Run RunnerCall Caller : nullAnd the program does not terminate.
- C. The program terminates after printing:Run RunnerCall Caller : Run
- D. An Execution is thrown at run time.
Answer: B
NEW QUESTION # 75
Which two statements are true about localizing an application? (Choose two.)
- A. Language codes use lowercase letters and region codes use uppercase letters.
- B. Language and region-specific programs are created using localized data.
- C. Support for new regional languages does not require recompilation of the code.
- D. Textual elements (messages and GUI labels) are hard-coded in the code.
- E. Resource bundle files include data and currency information.
Answer: A,C
Explanation:
Explanation/Reference:
Reference: http://docs.oracle.com/javase/7/docs/technotes/guides/intl/
NEW QUESTION # 76
Given the code fragment:
Which code fragment, when inserted at line n1, ensures false is printed?
- A. boolean b = cs.stream() .findFirst() .get() .equals("Java");
- B. boolean b = cs.stream() .anyMatch (w -> w.equals ("Java"));
- C. boolean b = cs.stream() .allMatch(w -> w.equals("Java"));
- D. boolean b = cs.stream() .findAny() .get() .equals("Java");
Answer: B
NEW QUESTION # 77
Given the code fragment:
public class ForTest {
public static void main(String[] args) {
int[] arrar = {1,2,3};
for ( foo ) {
}
}
}
Which three are valid replacements for foo so that the program will compiled and run?
- A. ; i < 1;
- B. int i = 0; i < 1; i++
- C. int i: array
- D. ; i < 1; i++
- E. ;;
Answer: B,C,E
NEW QUESTION # 78
Given the code fragment:
public void recDelete (String dirName) throws IOException {
File [ ] listOfFiles = new File (dirName) .listFiles();
if (listOfFiles ! = null && listOfFiles.length >0) {
for (File aFile : listOfFiles) {
if (aFile.isDirectory ()) {
recDelete (aFile.getAbsolutePath ());
} else {
if (aFile.getName ().endsWith (".class"))
aFile.delete ();
}
}
}
}
Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the
recDelete () method when it is invoked.
What is the result?
- A. The method throws an IOException.
- B. The method deletes all the .class files in the Projects directory and its subdirectories.
- C. The method deletes the .class files of the Projects directory only.
- D. The method executes and does not make any changes to the Projects directory.
Answer: B
NEW QUESTION # 79
......
Oracle 1z1-809 (Java SE 8 Programmer II) Certification Exam is a comprehensive exam that tests a candidate's knowledge of Java programming. 1z0-809 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. 1z0-809 exam covers a wide range of topics, including advanced Java concepts, database connectivity, and security.
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