Get instant access to 1z1-809 Practice Tests 2026 Free Updated Today!
Welcome to download the newest PassLeader 1z1-809 PDF dumps ( 209 Q&As)
The Oracle 1z1-809 exam includes a range of topics, including lambda expressions, collections, generics, and concurrency. It evaluates the candidate's understanding of various Java programming concepts and how effectively they can use them to solve complex programming problems. Upon successful completion of 1z1-809 exam, candidates can take on more challenging programming assignments and lead projects by designing and developing more integrated applications.
NEW QUESTION # 24
Given:
and the code fragment:
Which definition of the ColorSorterclass sorts the blocks list?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION # 25
Given:
class Worker extends Thread {
CyclicBarrier cb;
public Worker(CyclicBarrier cb) { this.cb = cb; }
public void run () {
try {
cb.await();
System.out.println("Worker...");
} catch (Exception ex) { }
}
}
class Master implements Runnable { //line n1
public void run () {
System.out.println("Master...");
}
}
and the code fragment:
Master master = new Master();
/ /line n2
Worker worker = new Worker(cb);
worker.start();
You have been asked to ensure that the runmethods of both the Workerand Masterclasses are executed.
Which modification meets the requirement?
- A. Replace line n1with class Master extends Thread {
- B. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);
- C. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);
- D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
Answer: A
NEW QUESTION # 26
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?
DOC MPEG JPEG
- A. MPEGMPEGJPEG
MPEGJPEG - B. MPEGJPEG
- C. The order of the output is unpredictable.
- D. MPEGJPEG
DOC MPEG MPEGJPEG
Answer: D
NEW QUESTION # 27
Given the code fragment:
Stream<Path> 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. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. All files and directories under the home directory are listed along with their attributes.
- D. The files in the home directory are listed along with their attributes.
Answer: C
NEW QUESTION # 28
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;
}
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(scr));
What is the result?
- A. [Java EE: Helen:Houston]
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] - B. Java EE
Java ME - C. A compilation error occurs.
- D. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
[Java EE: Helen:Houston]
Answer: B
NEW QUESTION # 29
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 n1.
- B. A compilation error occurs at line n2.
- C. The code prints the content of the employee.txtfile and throws an exception at line n3.
- D. A compilation error occurs at line n3.
Answer: C
NEW QUESTION # 30
Given the code fragment:
What is the result?
- A. Val:10 Val:20 Val:30
- B. Val: Val: Val
- C. Val:20 Val:40 Val:60
- D. A compilation error occurs.
Answer: A
NEW QUESTION # 31
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. The program prints Call Calland terminates.
- B. A compilation error occurs at line n1.
- C. An ExecutionExceptionis thrown at run time.
- D. The program prints Call Calland does not terminate.
Answer: D
NEW QUESTION # 32
Given the code fragment
Which code fragments, inserted independently, enable the code compile?
- A. fvar = 200; cvar = 400;
- B. cvar = 400;
- C. t.fvar = 200;
- D. this.fvar = 200;
Test2.cvar = 400; - E. this.fvar = 200; this.cvar = 400;
- F. t.fvar = 200; Test2.cvar = 400;
Answer: B
NEW QUESTION # 33
Given the code fragment:
Which code fragment, when inserted at line 3, enables the code to print 10:20?
- A. int array = new int [2] ;
- B. int [ ] array;
- C. int [ ] array = new int [2] ;
- D. int array [2] ;
Answer: C
NEW QUESTION # 34
Which action can be used to load a database driver by using JDBC3.0?
- A. Use the java.lang.Class.forNamemethod to load the driver class.
- B. Use the DriverManager.getDrivermethod to load the driver class.
- C. Add the driver class to the META-INF/services folder of the JAR file.
- D. Include the JDBC driver class in a jdbc.propertiesfile.
Answer: A
NEW QUESTION # 35
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 executes and does not make any changes to the Projects directory.
- D. The method deletes the .class files of the Projects directory only.
Answer: B
NEW QUESTION # 36
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<?, ?> percentage = new Foo <> (97, 32);
- B. Foo<String, String> pair = Foo.<String>twice ("Hello World!");
- C. Foo<String, String> grade = new Foo <> ("John", "A");
- D. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
Answer: A
NEW QUESTION # 37
Given:
public class SampleClass {
public static void main(String[] args) {
AnotherSampleClass asc = new AnotherSampleClass(); SampleClass sc = new SampleClass(); sc = asc; System.out.println("sc: " + sc.getClass()); System.out.println("asc: " + asc.getClass());
}}
class AnotherSampleClass extends SampleClass {
}
What is the result?
- A. sc: class AnotherSampleClass
asc: class AnotherSampleClass - B. sc: class SampleClass
asc: class AnotherSampleClass - C. sc: class Object
asc: class AnotherSampleClass - D. sc: class AnotherSampleClass
asc: class SampleClass
Answer: A
NEW QUESTION # 38
Given:
and
Which interface from the java.util.function package should you use to refactor the class Txt?
- A. Consumer
- B. Supplier
- C. Predicate
- D. Function
Answer: B
NEW QUESTION # 39
Given:
And given the code fragment:
What is the result?
- A. Compilation fails at line n1.
- B. 0:20
- C. 10:20
- D. Compilation fails at line n2.
Answer: D
NEW QUESTION # 40
Which statement is true about java.time.Duration?
- A. It tracks time zones.
- B. It preserves daylight saving time.
- C. It defines date-based values.
- D. It defines time-based values.
Answer: D
NEW QUESTION # 41
Given:
and the code fragment:
The threads t1and t2execute asynchronously and possibly prints ABCA or AACB.
You have been asked to modify the code to make the threads execute synchronously and prints ABC.
Which modification meets the requirement?
- A. Replace line n2 with:
public synchronized void run () { - B. Replace line n2 with:
volatile int count = 0; - C. Replace line n1 with:
private synchronized int count = 0; - D. start the threads t1and t2within a synchronizedblock.
Answer: D
Explanation:
Explanation/Reference:
NEW QUESTION # 42
Given the code fragment:
What is the result?
- A. 0
- B. Compilation fails.
- C. 1
- D. 2
Answer: C
NEW QUESTION # 43
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?
- A. Stream<String> stream = Files.find (Paths.get ("customers.txt")); stream.forEach((String c) -> System.out.println(c));
- B. Stream<String> lines = Files.lines (Paths.get ("customers.txt")); lines.forEach( c) -> System.out.println(c));
- C. Stream<Path> stream = Files.find (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));
- D. Stream<Path> stream = Files.list (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));
Answer: A
NEW QUESTION # 44
Given the code fragment:
List<Double> doubles = Arrays.asList (100.12, 200.32);
DoubleFunction funD = d -> d + 100.0;
doubles.stream (). forEach (funD); // line n1
doubles.stream(). forEach(e -> System.out.println(e)); // line n2
What is the result?
- A. 200.12
300.32 - B. A compilation error occurs at line n2.
- C. A compilation error occurs at line n1.
- D. 100.12
200.32
Answer: B
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION # 45
Which two statements are true about synchronization and locks? (Choose two.)
- A. A thread exclusively owns the intrinsic lock of an object between the time it acquires the lock and the
time it releases it. - B. A thread automatically acquires the intrinsic lock on a synchronized method's object when entering that
method. - C. The intrinsic lock will be retained by a thread if return from a synchronized method is caused by an
uncaught exception. - D. A thread automatically acquires the intrinsic lock on a synchronized statement when executed.
- E. Threads cannot acquire intrinsic locks on classes.
Answer: C,D
NEW QUESTION # 46
......
Oracle 1z0-809 (Java SE 8 Programmer II) Certification Exam is designed to test the advanced Java programming skills of professionals who have already earned the Oracle Certified Associate (OCA) Java SE 8 Programmer certification. 1z1-809 exam covers a range of topics related to Java SE 8, including functional programming, concurrency, generics, collections, and streams. Successful completion of the exam demonstrates a thorough understanding of these topics and the ability to apply them in real-world programming situations.
To take the Oracle 1z0-809 certification exam, candidates must have a good understanding of the Java programming language, including its syntax, operators, and data types. They should also be familiar with object-oriented programming concepts and design patterns. Additionally, candidates should have experience in developing Java applications and be comfortable with using various Java frameworks.
Jun-2026 Latest 2Pass4sure 1z1-809 Exam Dumps with PDF and Exam Engine: https://endexam.2pass4sure.com/Java-SE/1z1-809-actual-exam-braindumps.html