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1z0-809 Exam PDF [2023] Tests Free Updated Today with Correct 195 Questions
The 1z0-809 exam covers a wide range of topics, including Java Class Design, Advanced Inheritance, Generics and Collections, Lambda Expressions, Java File I/O (NIO.2), Concurrency, JDBC, Localization, and Annotations. Candidates are also expected to have experience with Java tools and technologies, including the Java Development Kit (JDK), the Java SE 8 API documentation, and the Java Platform, Enterprise Edition (Java EE). 1z0-809 exam consists of 85 multiple-choice and multiple-select questions and has a duration of 180 minutes. A passing score of 65% or higher is required to obtain certification.
Oracle 1z0-809 certification exam is a valuable credential for Java developers who want to demonstrate their expertise in Java SE 8 programming. Passing 1z0-809 exam validates your skills and knowledge in Java programming language and enhances your career opportunities. With proper preparation and dedication, you can achieve this certification and become a certified Java SE 8 Programmer II.
Oracle 1z0-809 exam is recognized globally and is highly valued in the IT industry. Passing 1z0-809 exam demonstrates the candidate's expertise in advanced Java programming, which can be beneficial in enhancing their career prospects. Java SE 8 Programmer II certification is also a testament to the candidate's commitment to their profession and the latest advancements in Java SE 8.
NEW QUESTION # 58
Which statement is true about java.time.Duration?
- A. It preserves daylight saving time.
- B. It tracks time zones.
- C. It defines date-based values.
- D. It defines time-based values.
Answer: D
Explanation:
Explanation/Reference:
Reference: http://tutorials.jenkov.com/java-date-time/duration.html#accessing-the-time-of-a-duration
NEW QUESTION # 59
Which code fragment is required to load a JDBC 3.0 driver?
- A. DriverManager.loadDriver ("org.xyzdata.jdbc.NetworkDriver");
- B. Connection con = DriverManager.getConnection("jdbc:xyzdata://localhost:3306/EmployeeDB");
- C. Class.forName("org.xyzdata.jdbc.NetworkDriver");
- D. Connection con = Connection.getDriver("jdbc:xyzdata://localhost:3306/EmployeeDB");
Answer: C
NEW QUESTION # 60
Given the for loop construct:
for ( expr1 ; expr2 ; expr3 ) {
statement;
}
Which two statements are true?
- A. The expression expr1 is optional. it initializes the loop and is evaluated once, as the loop begin.
- B. The expression expr3 must be present. It is evaluated after each iteration through the loop.
- C. This is not the only valid for loop construct; there exits another form of for loop constructor.
- D. When expr2 evaluates to false, the loop terminates. It is evaluated only after each iteration through the loop.
Answer: A,D
Explanation:
The for statement have this forms:
for (init-stmt; condition; next-stmt) {
body
}
There are three clauses in the for statement.
The init-stmt statement is done before the loop is started, usually to initialize an iteration
variable.
The condition expression is tested before each time the loop is done. The loop isn't
executed if the boolean expression is false (the same as the while loop).
The next-stmt statement is done after the body is executed. It typically increments an
iteration variable.
NEW QUESTION # 61
Given the code fragment:
class CallerThread implements Callable<String> {
String str;
public CallerThread(String s) {this.str=s;}
public String call() throws Exception {
return str.concat("Call");
}
}
and
public static void main (String[] args) throws InterruptedException,
ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1
Future f1 = es.submit (newCallerThread("Call"));
String str = f1.get().toString();
System.out.println(str);
}
Which statement is true?
- A. An ExecutionExceptionis thrown at run time.
- B. The program prints Call Calland does not terminate.
- C. A compilation error occurs at line n1.
- D. The program prints Call Calland terminates.
Answer: B
NEW QUESTION # 62
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
(o1); } } );
treeMap.putAll (unsortMap);
for (Map.Entry<Integer, String> entry : treeMap.entrySet () ) {
System.out.print (entry.getValue () + " ");
}
}
}
What is the result?
- A. z b d e j
- B. d b e z j
- C. j z e b d
- D. A compilation error occurs.
Answer: C
NEW QUESTION # 63
Given:
public class product {
int id; int price;
public Product (int id, int price) {
this.id = id;
this.price = price;
}
public String toString() { return id + ":" + price; }
}
and the code fragment:
List<Product> products = Arrays.asList(new Product(1, 10),
new Product (2, 30),
new Product (2, 30));
Product p = products.stream().reduce(new Product (4, 0), (p1, p2) -> {
p1.price+=p2.price;
return new Product (p1.id, p1.price);});
products.add(p);
products.stream().parallel()
.reduce((p1, p2) - > p1.price > p2.price ? p1 : p2)
.ifPresent(System.out: :println);
What is the result?
- A. The program prints nothing.
- B. 4 : 60
- C. 4 : 60
2 : 30
3 : 20
1 : 10 - D. 2 : 30
- E. 4 : 0
Answer: B
NEW QUESTION # 64
Given:
Which statement is true?
- A. p, r, and s are accessible via obj.
- B. Both p and s are accessible via obj.
- C. Only s is accessible via obj.
- D. Both r and s are accessible via obj.
Answer: C
NEW QUESTION # 65
Given:
class RateOfInterest {
public static void main (String[] args) {
int rateOfInterest = 0;
String accountType = "LOAN";
switch (accountType) {
case "RD";
rateOfInterest = 5;
break;
case "FD";
rateOfInterest = 10;
break;
default:
assert false: "No interest for this account"; //line n1
}
System.out.println ("Rate of interest:" + rateOfInterest);
}
}
and the command:
java -ea RateOfInterest
What is the result?
Rate of interest: 0
- A.
- B. An AssertionError is thrown.
No interest for this account - C.
- D. A compilation error occurs at line n1.
Answer: B
NEW QUESTION # 66
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. Searching... Searching...
- B. A compilation error occurs.
- C. Searching... Searching... Searching...
- D. Searching...
Answer: B
NEW QUESTION # 67
Which statement best describes encapsulation?
- A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.
- B. Encapsulation ensures that classes can be designed so that their methods are inheritable.
- C. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x, any subclass of MyType can be passed to that method.
- D. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.
Answer: A
Explanation:
http://www.tutorialspoint.com/java/java_encapsulation.htm
NEW QUESTION # 68
Given the code fragment:
What is the result?
- A. Compilation fails.
- B. 1 2 3 4
- C. 1 2 3 4
followed by an ArrayIndexOutOfBoundsException - D. 1 2 3
Answer: D
NEW QUESTION # 69
Given:
What is the result?
- A. -catch-
- B. -catch-
-finally-
-dostuff- - C. -finally
-dostuff-
-catch- - D. -finally-
-catch-
Answer: D
NEW QUESTION # 70
Which action can be used to load a database driver by using JDBC3.0?
- A. Add the driver class to the META-INF/services folder of the JAR file.
- B. Use the DriverManager.getDrivermethod to load the driver class.
- C. Use the java.lang.Class.forNamemethod to load the driver class.
- D. Include the JDBC driver class in a jdbc.propertiesfile.
Answer: C
NEW QUESTION # 71
Given:
and
Which interface from the java.util.functionpackage should you use to refactor the class Txt?
- A. Consumer
- B. Predicate
- C. Function
- D. Supplier
Answer: D
NEW QUESTION # 72
Given:
What is the result?
- A. Bar HelloBaz Hello
- B. Bar HelloFoo Hello
- C. Baz Hello
- D. A compilation error occurs in the Daze class.
Answer: A
NEW QUESTION # 73
Given the code fragments:
and
What is the result?
- A. null
- B. [Dog, Cat, Mouse]
- C. A compilation error occurs.
- D. DogCatMouse
Answer: B
NEW QUESTION # 74
Given the code fragment:
What is the result?
- A. 6 : 5 : 6
- B. 5 : 3 : 6
- C. 4 : 4 : 4
- D. 3 : 3 : 4
Answer: C
NEW QUESTION # 75
Given:
What is the result?
- A. Area is 3.0
- B. Compilation fails at line n2.
- C. Compilation fails at line n1.
- D. Area is 6.0
Answer: B
NEW QUESTION # 76
Given:
class Sum extends RecursiveAction { //line n1
static final int THRESHOLD_SIZE = 3;
int stIndex, lstIndex;
int [ ] data;
public Sum (int [ ]data, int start, int end) {
this.data = data;
this stIndex = start;
this. lstIndex = end;
}
protected void compute ( ) {
int sum = 0;
if (lstIndex - stIndex <= THRESHOLD_SIZE) {
for (int i = stIndex; i < lstIndex; i++) {
sum += data [i];
}
System.out.println(sum);
} else {
new Sum (data, stIndex + THRESHOLD_SIZE, lstIndex).fork( );
new Sum (data, stIndex,
Math.min (lstIndex, stIndex + THRESHOLD_SIZE)
).compute ();
}
}
}
and the code fragment:
ForkJoinPool fjPool = new ForkJoinPool ( ); int data [ ] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} fjPool.invoke (new Sum (data, 0, data.length));
and given that the sum of all integers from 1 to 10 is 55. Which statement is true?
- A. A compilation error occurs at line n1.
- B. The program prints several values whose sum exceeds 55.
- C. The program prints 55.
- D. The program prints several values that total 55.
Answer: A
NEW QUESTION # 77
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. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>) es.execute(c1);
- B. es.execute (r1);Future<String> f1 = es.execute (c1) ;
- C. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);
- D. es.submit(r1);Future<String> f1 = es.submit (c1);
Answer: D
NEW QUESTION # 78
Given the code fragment:
Path p1 = Paths.get("/Pics/MyPic.jpeg");
System.out.println (p1.getNameCount() +
":" + p1.getName(1) +
":" + p1.getFileName());
Assume that the Pics directory does NOT exist.
What is the result?
- A. 1:Pics:/Pics/ MyPic.jpeg
- B. 2:MyPic.jpeg: MyPic.jpeg
- C. An exception is thrown at run time.
- D. 2:Pics: MyPic.jpeg
Answer: B
NEW QUESTION # 79
Given:
Which two interfaces can you use to create lambda expressions? (Choose two.)
- A. S
- B. P
- C. Q
- D. U
- E. T
- F. R
Answer: A,B
NEW QUESTION # 80
For which three objects must a vendor provide implementations in its JDBC driver?
- A. DriverManager
- B. Statement
- C. SQLException
- D. Time
- E. ResultSet
- F. Connection
- G. Date
Answer: B,E,F
Explanation:
Explanation
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.
NEW QUESTION # 81
Given the code fragment:
List<String> codes = Arrays.asList ("DOC", "MPEG", "JPEG");
codes.forEach (c -> System.out.print(c + " "));
String fmt = codes.stream()
. filter (s-> s.contains ("PEG"))
. reduce((s, t) -> s + t).get();
System.out.println("\n" + fmt);
What is the result?
- A. DOC MPEG JPEG
MPEGJPEG - B. DOC MPEG MPEGJPEG
MPEGMPEGJPEG - C. The order of the output is unpredictable.
- D. MPEGJPEG
MPEGJPEG
Answer: A
NEW QUESTION # 82
Which class definition compiles?
- A. Option B
- B. Option C
- C. Option D
- D. Option A
Answer: D
NEW QUESTION # 83
......
Verified & Correct 1z0-809 Practice Test Reliable Source Aug 19, 2023 Updated: https://actualtests.realvalidexam.com/1z0-809-real-exam-dumps.html
