[Mar 22, 2026] 1z1-809 Dumps PDF and Test Engine Exam Questions - Prep4pass
Verified 1z1-809 exam dumps Q&As with Correct 209 Questions and Answers
Preparation for the 1z1-809 exam typically involves studying the exam objectives, reading related textbooks, and practicing with sample questions and simulations. Oracle also offers official training courses that can help prepare candidates for the exam. These courses cover all the topics tested on the 1z1-809 exam and provide hands-on lab exercises to reinforce learning.
NEW QUESTION # 54
Given:
Which two classes use the shape class correctly?
- A. Option E
- B. Option D
- C. Option F
- D. Option C
- E. Option B
- F. Option A
Answer: A,E
Explanation:
When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class (E). However, if it does not, then the subclass must also be declared abstract (B). Note: An abstract class is a class that is declared abstract-it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
NEW QUESTION # 55
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. A compilation error occurs at line n1.
- B. The program prints Call Calland terminates.
- C. The program prints Call Calland does not terminate.
- D. An ExecutionExceptionis thrown at run time.
Answer: C
NEW QUESTION # 56
Given the code fragment:
What is the result?
- A. 1000 : 2000
- B. 4000 : 1000
- C. 4000 : 2000
- D. 1000 : 4000
Answer: B
NEW QUESTION # 57
Given the code snippet from a compiled Java source file:
Which command-line arguments should you pass to the program to obtain the following output?
Arg is 2
- A. java MyFile 2 1 2
- B. java MyFile 1 2 2 3 4
- C. java MyFile 1 3 2 2
- D. java MyFile 0 1 2 3
Answer: C
NEW QUESTION # 58
Given that data.txt and alldata.txt are accessible, and the code fragment:
What is required at line n1to enable the code to overwrite alldata.txtwith data.txt?
- A. bw.flush();
- B. br.flush();
- C. br.close();
- D. bw.writeln();
Answer: A
NEW QUESTION # 59
Given the code fragments:
and
What is the result?
- A. A compilation error occurs.
- B. DogCatMouse
- C. [Dog, Cat, Mouse]
- D. null
Answer: C
NEW QUESTION # 60
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...
Searching... - B. A compilation error occurs.
- C. Searching...
Searching... - D. Searching...
Answer: D
NEW QUESTION # 61
Given the code fragments:
public class Book implements Comparator<Book> {
String name;
double price;
public Book () {}
public Book(String name, double price) {
this.name = name;
this.price = price;
}
public int compare(Book b1, Book b2) {
return b1.name.compareTo(b2.name);
}
public String toString() {
return name + ":" + price;
}
}
and
List<Book>books = Arrays.asList (new Book ("Beginning with Java", 2), new book
( "A
Guide to Java Tour", 3));
Collections.sort(books, new Book());
System.out.print(books);
What is the result?
- A. [A Guide to Java Tour:3.0, Beginning with Java:2.0]
- B. A compilation error occurs because the Book class does not override the abstract method compareTo
(). - C. [Beginning with Java:2, A Guide to Java Tour:3]
- D. An Exceptionis thrown at run time.
Answer: A
NEW QUESTION # 62
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. A compilation error occurs because the IOException isn't declared to be thrown or caught?
- D. The code reads the password without echoing characters on the console.
Answer: C
NEW QUESTION # 63
Which two methods from the java.util.stream.Streaminterface perform a reduction operation?
(Choose two.)
- A. peek ()
- B. filter ()
- C. distinct ()
- D. count ()
- E. collect ()
Answer: D,E
Explanation:
Explanation/Reference:
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/stream/package-summary.html
NEW QUESTION # 64
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)
public abstract class Task implements Doable {
- A. public void doSomething(Integer i) { }
}
public class Action implements Doable { - B. public abstract void doSomething(String s) { }
public void doYourThing(Boolean b) { }
}
public class Job implements Doable { - C. public void doSomething(Integer i) { }
public String doThis(Integer j) { }
}
public class Do implements Doable { - D. public void doSomethingElse(String s) { }
}
public abstract class Work implements Doable { - E. public void doSomething(Integer i) { }
public void doSomething(String s) { }
public void doThat (String s) { }
}
Answer: D,E
Explanation:
Explanation/Reference:
NEW QUESTION # 65
Given the code fragment:
What is the result?
- A. text1text2
- B. text1
- C. [text1, text2]
- D. text1text2text2text3
Answer: A
NEW QUESTION # 66
Given that data.txt and alldata.txt are accessible, and the code fragment:
What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?
- A. bw.flush();
- B. br.flush();
- C. br.close();
- D. bw.writeln();
Answer: A
NEW QUESTION # 67
Given the definition of the Vehicle class:
Class Vehhicle {
int distance;//line n1
Vehicle (int x) {
this distance = x;
}
public void increSpeed(int time) {//line n2
int timeTravel = time;//line n3
class Car {
int value = 0;
public void speed () {
value = distance /timeTravel;
System.out.println ("Velocity with new speed"+value+"kmph");
}
}
new Car().speed();
}
}
and this code fragment:
Vehicle v = new Vehicle (100);
v.increSpeed(60);
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. A compilation error occurs at line n3.
- D. Velocity with new speed
Answer: D
NEW QUESTION # 68
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 Projectscontains subdirectories that contain .classfiles 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 the .classfiles of the Projectsdirectory only.
- C. The method deletes all the .classfiles in the Projectsdirectory and its subdirectories.
- D. The method executes and does not make any changes to the Projectsdirectory.
Answer: B
NEW QUESTION # 69
Given that version.txtis accessible and contains:
1234567890
and given the code fragment:
What is the result?
121
- A.
- B. 0
- C. 1
- D. The program prints nothing.
Answer: C
NEW QUESTION # 70
......
Preparing for the Oracle 1z0-809 certification exam requires a comprehensive understanding of Java SE 8 programming concepts and practical experience in writing Java applications. You can start your preparation by reviewing the exam objectives, taking practice tests, and reading recommended books and tutorials. Also, attending training courses and workshops can help you acquire the necessary knowledge and skills to pass the exam.
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