2025 Latest 1z1-809 DUMPS Q&As with Explanations Verified & Correct Answers
1z1-809 dumps Exam Material with 209 Questions
Oracle 1z1-809 exam is a challenging exam that requires a deep understanding of the Java programming language. Candidates who pass 1z1-809 exam are considered to be skilled Java programmers who are capable of developing complex Java applications. 1z1-809 exam consists of 85 questions that need to be completed within 150 minutes. 1z1-809 exam is available in English and Japanese languages.
NEW QUESTION # 33
You want to create a singleton class by using the Singleton design pattern.
Which two statements enforce the singleton nature of the design?
- A. Override equals() and hashCode() methods of the java.lang.Object class.
- B. Make the class static.
- C. Make the constructor private.
- D. Use a static reference to point to the single instance.
- E. Implement the Serializable interface.
Answer: C,D
NEW QUESTION # 34
Given:
Your design requires that:
* fuelLevel of Engine must be greater than zero when the start()method is invoked.
* The code must terminate if fuelLevelof Engineis less than or equal to zero.
Which code fragment should be added at line n1to express this invariant condition?
- A. assert (fuelLevel) : "Terminating...";
- B. assert fuelLevel > 0: "Impossible fuel" ;
- C. assert (fuelLevel > 0) : System.out.println ("Impossible fuel");
- D. assert fuelLevel < 0: System.exit(0);
Answer: D
NEW QUESTION # 35
Given the code fragment:
List<String> nL = Arrays.asList("Jim", "John", "Jeff");
Function<String, String> funVal = s -> "Hello : ".contact(s);
nL.Stream()
.map(funVal)
.peek(System.out::print);
What is the result?
- A. Hello : Jim Hello : John Hello : Jeff
- B. A compilation error occurs.
- C. The program prints nothing.
- D. Jim John Jeff
Answer: C
NEW QUESTION # 36
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)
public abstract class Task implements Doable {
- A. public void doSomethingElse(String s) { }
}
public abstract class Work implements Doable { - B. public void doSomething(Integer i) { }
public String doThis(Integer j) { }
}
public class Do implements Doable { - C. public void doSomething(Integer i) { }
public void doSomething(String s) { }
public void doThat (String s) { }
} - D. public abstract void doSomething(String s) { }
public void doYourThing(Boolean b) { }
}
public class Job implements Doable { - E. public void doSomething(Integer i) { }
}
public class Action implements Doable {
Answer: A,C
Explanation:
Explanation/Reference:
NEW QUESTION # 37
Which statement is true about java.util.stream.Stream?
- A. Streams are intended to modify the source data.
- B. The execution mode of streams can be changed during processing.
- C. A stream cannot be consumed more than once.
- D. A parallel stream is always faster than an equivalent sequential stream.
Answer: C
NEW QUESTION # 38
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. Searching...
- C. A compilation error occurs.
- D. Searching...
Searching...
Searching...
Answer: B
NEW QUESTION # 39
Given the content:
and given the code fragment:
Which two code fragments, when inserted at line 1 independently, enable the code to print "Wie geht's?"
- A. currentLocale = new Locale.Builder ().setLanguage ("de").setRegion ("DE").build();
- B. currentLocale = new Locale ("de", "DE");
- C. currentlocale = new Locale();currentLocale.setLanguage ("de");currentLocale.setRegion ("DE");
- D. currentLocale = Locale.GERMAN;
- E. currentLocale = Locale.getInstance(Locale.GERMAN,Locale.GERMANY);
Answer: A,C
NEW QUESTION # 40
Given the following array:
Which two code fragments, independently, print each element in this array?
- A. Option A
- B. Option E
- C. Option F
- D. Option B
- E. Option D
- F. Option C
Answer: A,B
NEW QUESTION # 41
Which two reasons should you use interfaces instead of abstract classes?
- A. You want to share code among several closely related classes.
- B. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
- C. You want to declare non-static on non-final fields.
- D. You expect that unrelated classes would implement your interfaces.
- E. You want to take advantage of multiple inheritance of type.
Answer: B,E
NEW QUESTION # 42
Which statement is true about the DriverManagerclass?
- A. it executes SQL statements against the database.
- B. It returns an instance of Connection.
- C. it is written by different vendors for their specific database.
- D. It only queries metadata of the database.
Answer: B
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 # 43
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 java.lang.Class.forName method to load the driver class.
- C. Use the DriverManager.getDriver method to load the driver class.
- D. Include the JDBC driver class in a jdbc.properties file.
Answer: C
NEW QUESTION # 44
Given:
What is the result?
- A. C
- B. A B C
- C. C B A
- D. Compilation fails at line n1 and line n2.
Answer: B
NEW QUESTION # 45
Given the code fragment:
What is the result?
- A. 13480.02
- B. An exception is thrown at runtime.
- C. Compilation fails.
- D. 13480.0
Answer: D
NEW QUESTION # 46
Given:
public final class IceCream {
public void prepare() {}
}
public class Cake {
public final void bake(int min, int temp) {}
public void mix() {}
}
public class Shop {
private Cake c = new Cake ();
private final double discount = 0.25;
public void makeReady () { c.bake(10, 120); }
}
public class Bread extends Cake {
public void bake(int minutes, int temperature) {}
public void addToppings() {}
}
Which statement is true?
- A. All classes compile successfully.
- B. A compilation error occurs in Bread
- C. A compilation error occurs in Shop.
- D. A compilation error occurs in Cake.
- E. A compilation error occurs in IceCream.
Answer: B
NEW QUESTION # 47
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 ME: Jessy:Chicago, Java ME: Mark:Chicago]
[Java EE: Helen:Houston] - B. [Java EE: Helen:Houston]
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago] - C. A compilation error occurs.
- D. Java EE
Java ME
Answer: A
NEW QUESTION # 48 
What is the result?
- A. 0
- B. A compilation error occurs at line 8.
- C. A compilation error occurs at line 15.
- D. A compilation error occurs at line 7.
Answer: A
NEW QUESTION # 49
Given the code fragment:
What is the result?
- A. Java SEJava EE
Java EEJava SE - B. Java EEJava EESE
- C. Java EESE
- D. The program prints either:
Java EEJava SE
Answer: A
NEW QUESTION # 50
Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
- A. Class C extends B implements X, Y { }
- B. Class C implements X, Y extends B { }
- C. Class C extends A, B { }
- D. Class C extends A implements X { }
- E. Class C implements Y extends B { }
Answer: A,D
Explanation:
extends is for extending a class.
implements is for implementing an interface. Java allows for a class to implement many interfaces.
NEW QUESTION # 51
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. The files in the home directory are listed along with their attributes.
- B. A compilation error occurs at line n1.
- C. A compilation error occurs at line n2.
- D. All files and directories under the home directory are listed along with their attributes.
Answer: D
NEW QUESTION # 52
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/log/sys /server/exe/readme
- B. /app/./sys/log /server/exe/readme
- C. /app/sys/log /readme/server/exe
- D. /app/./sys/log /readme
Answer: B
NEW QUESTION # 53
Given the code fragment:
ZonedDateTime depart = ZonedDateTime.of(2015, 1, 15, 3, 0, 0, 0, ZoneID.of("UTC-7")); ZonedDateTime arrive = ZonedDateTime.of(2015, 1, 15, 9, 0, 0, 0, ZoneID.of("UTC-5")); long hrs = ChronoUnit.HOURS.between(depart, arrive); //line n1 System.out.println("Travel time is" + hrs + "hours"); What is the result?
- A. Travel time is 4 hours
- B. Travel time is 8 hours
- C. An exception is thrown at line n1.
- D. Travel time is 6 hours
Answer: C
NEW QUESTION # 54
......
By passing the Oracle 1z0-809 exam, candidates can demonstrate their proficiency in Java programming and increase their chances of getting hired for Java developer roles. Java SE 8 Programmer II certification is also recognized by employers as proof of an individual's expertise in Java programming and can lead to higher salaries and better job opportunities.
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