[Mar 27, 2026] Free Java SE 1z1-809 Official Cert Guide PDF Download
Oracle 1z1-809 Official Cert Guide PDF
Oracle 1z1-809 certification exam is designed for Java programmers who are seeking to enhance their skills and knowledge in Java SE 8 programming. Java SE 8 Programmer II certification exam is an advanced level exam that validates the candidate's abilities to create efficient and effective Java applications. 1z1-809 exam tests the candidate's understanding of Java concepts such as lambda expressions, functional interfaces, and streams.
NEW QUESTION # 123
Given:
Class A { }
Class B { }
Interface X { }
Interface Y { }
Which two definitions of class C are valid?
- A. Class C extends A, B { }
- B. Class C extends B implements X, Y { }
- C. Class C implements Y extends B { }
- D. Class C implements X, Y extends B { }
- E. Class C extends A implements X { }
Answer: B,E
NEW QUESTION # 124
Given the code fragment:
What is the result?
- A. 0
- B. A compilation error occurs at line n1.
- C. A compilation error occurs at line n2.
- D. 1
Answer: C
NEW QUESTION # 125
Given: What is the result?
- A. Marrown String out of limits JesOran
- B. Marrown String out of limits Array out of limits
- C. Marrown NanRed JesOran
- D. Marrown String out of limits
Answer: A
NEW QUESTION # 126
Given the code fragments:
and
What is the result?
- A. class java.io.IOException
- B. A compilation error occurs.
- C. class java.lang.Exception
- D. Video played.Game played.
Answer: C
NEW QUESTION # 127
Given the code fragment:
9. Connection conn = DriveManager.getConnection(dbURL, userName, passWord);
10. String query = "SELECT id FROM Employee";
11. try (Statement stmt = conn.createStatement()) {
12. ResultSet rs = stmt.executeQuery(query);
13. stmt.executeQuery("SELECT id FROM Customer");
14. while (rs.next()) {
15. //process the results
16. System.out.println("Employee ID: "+ rs.getInt("id"));
17. }
18. } catch (Exception e) {
19. System.out.println ("Error");
20. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The Employee and Customer tables 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 Error.
- B. compilation fails on line 13.
- C. The program prints customer IDs.
- D. The program prints employee IDs.
Answer: A
NEW QUESTION # 128
Given:
and the code fragment:
What is the result?
- A. A compilation error occurs at line n2.
- B. A compilation error occurs because the tryblock doesn't have a catchor finallyblock.
- C. The program compiles successfully.
- D. A compilation error occurs at line n1.
Answer: B
NEW QUESTION # 129
Given:
and the code fragment:
What is the result?
true
- A. true
false - B. false
true - C. false
- D. true
false
Answer: A
NEW QUESTION # 130
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. Moveable can be used as below:
Moveable<Integer> animal = n - > n + 10;
animal.run(100);
animal.walk(20); - B. Moveable can be used as below:
Moveable<Integer> animal = n - > System.out.println("Running" + n);
animal.run(100);
animal.walk(20); - C. Movable cannot be used in a lambda expression.
- D. Moveable can be used as below:
Moveable animal = (Integer n) - > System.out.println(n);
animal.run(100);
Moveable.walk(20);
Answer: A
NEW QUESTION # 131
Given:
class ImageScanner implements AutoCloseable {
public void close () throws Exception {
System.out.print ("Scanner closed.");
}
public void scanImage () throws Exception {
System.out.print ("Scan.");
throw new Exception("Unable to scan.");
}
}
class ImagePrinter implements AutoCloseable {
public void close () throws Exception {
System.out.print ("Printer closed.");
}
public void printImage () {System.out.print("Print."); }
}
and this code fragment:
try (ImageScanner ir = new ImageScanner();
ImagePrinter iw = new ImagePrinter()) {
ir.scanImage();
iw.printImage();
} catch (Exception e) {
System.out.print(e.getMessage());
}
What is the result?
- A. Scan. Unable to scan. Printer closed.
- B. Scan.Scanner closed. Unable to scan.
- C. Scan.Printer closed. Scanner closed. Unable to scan.
- D. Scan. Unable to scan.
Answer: C
NEW QUESTION # 132
Given the code fragments:
class TechName {
String techName;
TechName (String techName) {
this.techName=techName;
}
}
and
List<TechName> tech = Arrays.asList (
new TechName("Java-"),
new TechName("Oracle DB-"),
new TechName("J2EE-")
);
Stream<TechName> stre = tech.stream();
//line n1
Which should be inserted at line n1 to print Java-Oracle DB-J2EE-?
- A. stre.map(a-> a.techName).forEach(System.out::print);
- B. stre.forEach(System.out::print);
- C. stre.map(a-> a).forEachOrdered(System.out::print);
- D. stre.forEachOrdered(System.out::print);
Answer: C
NEW QUESTION # 133
Given the code fragments:
and
What is the result?
- A. Optional [France]
Optional [NotFound] - B. France
Not Found - C. Optional[France]
Not Found - D. France
Optional[NotFound]
Answer: B
NEW QUESTION # 134
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<Path> stream = Files.find (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));
- C. Stream<Path> stream = Files.list (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));
- D. Stream<String> lines = Files.lines (Paths.get ("customers.txt")); lines.forEach( c) -> System.out.println(c));
Answer: A
NEW QUESTION # 135
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?
- A. No interest for this account
- B. Rate of interest: 0
- C. An AssertionError is thrown.
- D. A compilation error occurs at line n1.
Answer: C
NEW QUESTION # 136
Which two reasons should you use interfaces instead of abstract classes?
- A. You want to take advantage of multiple inheritance of type.
- B. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
- C. You expect that unrelated classes would implement your interfaces.
- D. You want to share code among several closely related classes.
- E. You want to declare non-static on non-final fields.
Answer: A,B
NEW QUESTION # 137
Given the code fragment:
List<Integer> nums = Arrays.asList (10, 20, 8):
System.out.println (
//line n1
);
Which code fragment must be inserted at line n1to enable the code to print the maximum number in
the numslist?
- A. nums.stream().max(Comparator.comparing(a -> a)).get()
- B. nums.stream().max(Integer : : max).get()
- C. nums.stream().max()
- D. nums.stream().map(a -> a).max()
Answer: A
NEW QUESTION # 138
Given the code fragment:
public class FileThread implements Runnable {
String fName;
public FileThread(String fName) { this.fName = fName; }
public void run () System.out.println(fName);}
public static void main (String[] args) throws IOException,
InterruptedException {
ExecutorService executor = Executors.newCachedThreadPool();
Stream<Path> listOfFiles = Files.walk(Paths.get("Java Projects"));
listOfFiles.forEach(line -> {
executor.execute(new FileThread(line.getFileName().toString
())); //
line n1
});
executor.shutdown();
executor.awaitTermination(5, TimeUnit.DAYS); //
line n2
}
}
The Java Projects directory exists and contains a list of files.
What is the result?
- A. The program prints files names sequentially.
- B. The program throws a runtime exception at line n2.
- C. A compilation error occurs at line n1.
- D. The program prints files names concurrently.
Answer: D
NEW QUESTION # 139
Given the code fragments:
and
What is the result?
- A. DogCatMouse
- B. A compilation error occurs.
- C. [Dog, Cat, Mouse]
- D. null
Answer: C
NEW QUESTION # 140
Given the code fragments :
and
What is the result?
- A. A compilation error occurs.
- B. TV Price :1000 Refrigerator Price :2000
- C. TV Price :110 Refrigerator Price :2100
- D. The program prints nothing.
Answer: C
NEW QUESTION # 141
Given:
public class ScopeTest {
int j, int k;
public static void main(String[] args) {
ew ScopeTest().doStuff(); }
void doStuff() {
nt x = 5;
oStuff2();
System.out.println("x");
}
void doStuff2() {
nt y = 7;
ystem.out.println("y");
or (int z = 0; z < 5; z++) {
ystem.out.println("z");
ystem.out.println("y");
}
Which two items are fields?
- A. x
- B. k
- C. y
- D. j
- E. z
Answer: B,D
NEW QUESTION # 142
Which two code blocks correctly initialize a Locale variable?
- A. Locale loc4 = Locale.UK;
- B. Locale loc5 = new Locale ("ru", "RU");
- C. Locale loc2 = Locale.getInstance("ru");
- D. Locale loc3 = Locale.getLocaleFactory("RU");
- E. Locale loc1 = "UK";
Answer: A,B
NEW QUESTION # 143
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