Practice Test for 1z0-809 Certification Real 2025 Mock Exam
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Oracle 1z1-809 exam is a highly regarded certification that is recognized globally. It validates the skills and expertise of Java developers in advanced programming concepts such as collections, generics, lambda expressions, functional interfaces, and streams. Passing 1z0-809 exam demonstrates that the individual has the knowledge and skills necessary to develop complex Java applications.
Oracle 1z0-809 (Java SE 8 Programmer II) Exam is a certification exam designed for experienced Java developers who want to validate their skills and knowledge in advanced areas of Java programming. 1z0-809 exam is designed to test the candidate’s ability to write code using Java SE 8 programming language features such as Lambda expressions, functional interfaces, and streams. 1z0-809 exam also tests the candidate’s knowledge of Java SE 8 API specifications, concurrency, JDBC API, and localization.
NEW QUESTION # 110
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 employee IDs.
- B. compilation fails on line 13.
- C. The program prints Error.
- D. The program prints customer IDs.
Answer: C
NEW QUESTION # 111
Given the code fragment:
Which three code fragments are valid at line n1?
- A. Option B
- B. Option E
- C. Option C
- D. Option D
- E. Option A
Answer: A,B,C
NEW QUESTION # 112
Given the code fragment:
public static void main (String [ ] args) throws IOException {
BufferedReader br = new BufferedReader (new InputStremReader (System.in));
System.out.print ("Enter GDP: ");
/ /line 1
}
Which code fragment, when inserted at line 1, enables the code to read the GDP from the user?
- A. int GDP = br.read();
- B. int GDP = br.nextInt();
- C. int GDP = Integer.parseInt (br.next());
- D. int GDP = Integer.parseInt (br.readline());
Answer: D
NEW QUESTION # 113
Given the code fragment:
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 table has a column ID of type integer and the SQL query matches one record.
What is the result?
- A. Compilation fails at line 15.
- B. The code prints Error.
- C. The code prints the employee ID.
- D. Compilation fails at line 14.
Answer: C
NEW QUESTION # 114
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. A compilation error occurs at line n3.
- D. The code prints the content of the employee.txt file and throws an exception at line n3.
Answer: A
NEW QUESTION # 115
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. The program prints several values whose sum exceeds 55.
- B. A compilation error occurs at line n1.
- C. The program prints 55.
- D. The program prints several values that total 55.
Answer: B
NEW QUESTION # 116
Given the records from the Employee table:
and given the code fragment:
try {
Connection conn = DriverManager.getConnection (URL, userName, passWord);
Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE);
st.execute("SELECT*FROM Employee");
ResultSet rs = st.getResultSet();
while (rs.next()) {
if (rs.getInt(1) ==112) {
rs.updateString(2, "Jack");
}
}
rs.absolute(2);
System.out.println(rs.getInt(1) + " " + rs.getString(2));
} catch (SQLException ex) {
System.out.println("Exception is raised");
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database accessible with the URL, userName, and passWord exists.
What is the result?
- A. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jack - B. The Employee table is not updated and the program prints:
112 Jerry - C. The Employee table is updated with the row:
112 Jack
and the program prints:
112 Jerry - D. The program prints Exception is raised.
Answer: D
NEW QUESTION # 117
Given:
and the code fragment:
Which definition of the ColorSorter class sorts the blocks list?
- A. Option B
- B. Option C
- C. Option D
- D. Option A
Answer: B
NEW QUESTION # 118
public class ForTest {
public static void main(String[] args) {
int[] arrar = {1,2,3};
for ( foo ) {
}
}
}
Which three are valid replacements for foo so that the program will compiled and run?
- A. ;;
- B. ; i < 1;
- C. ; i < 1; i++
- D. int i: array
- E. int i = 0; i < 1; i++
Answer: A,D,E
NEW QUESTION # 119
Given:
And given the commands:
What is the result?
- A. true false
- B. true true
- C. A ClassCastException is thrown at runtime.
- D. false false
- E. TRUE null
Answer: A
NEW QUESTION # 120
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, "A");
books.put (1002, "C");
books.put (1001, "B");
books.put (1003, "B");
System.out.println (books);
What is the result?
- A. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- B. {1002 = C, 1003 = B, 1007 = A}
- C. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
- D. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
Answer: C
Explanation:
References:
NEW QUESTION # 121
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?
- A. Stream<String> lines = Files.lines (Paths.get ("customers.txt"));lines.forEach( 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> stream = Files.find (Paths.get ("customers.txt"));stream.forEach((String c) -> System.out.println(c));
Answer: A
NEW QUESTION # 122
Given:
class CheckClass {
public static int checkValue (String s1, String s2) {
return s1 length() - s2.length();
}
}
and the code fragment:
String[] strArray = new String [] {"Tiger", "Rat", "Cat", "Lion"}
/ /line n1
for (String s : strArray) {
System.out.print (s + " ");
}
Which code fragment should be inserted at line n1 to enable the code to print Rat Cat Lion Tiger?
- A. Arrays.sort(strArray, (CheckClass : : new) : : checkValue);
- B. Arrays.sort(strArray, (CheckClass : : new).checkValue);
- C. Arrays.sort(strArray, CheckClass : : checkValue);
- D. Arrays.sort(strArray, CheckClass : : new : : checkValue);
Answer: D
NEW QUESTION # 123
Which code fragment is required to load a JDBC 3.0 driver?
- A. Connection con = Connection.getDriver("jdbc:xyzdata://localhost:3306/EmployeeDB");
- B. DriverManager.loadDriver ("org.xyzdata.jdbc.NetworkDriver");
- C. Class.forName("org.xyzdata.jdbc.NetworkDriver");
- D. Connection con = DriverManager.getConnection("jdbc:xyzdata://localhost:3306/EmployeeDB");
Answer: C
NEW QUESTION # 124
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n1.
- B. Logged out at: 2015-01-12T21:58:00Z
- C. Logged out at: 2015-01-12T21:58:19.880Z
- D. Can't logout
Answer: B
NEW QUESTION # 125
Given:
class Vehicle {
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?
- A. A compilation error occurs.
- B. A ClassCastException is thrown at run time.
- C. 10124 BMW10123 Ford
- D. 10123 Ford10124 BMW
Answer: B
NEW QUESTION # 126
Given the definition of the Bookclass:
Which statement is true about the Bookclass?
- A. It demonstrates polymorphism.
- B. It is an immutable class.
- C. It demonstrates encapsulation.
- D. It is defined using the factory design pattern.
- E. It is defined using the singleton design pattern.
Answer: C
NEW QUESTION # 127
What is the proper way to defined a method that take two int values and returns their sum as an int value?
- A. sum(int first, int second) { return first + second; }
- B. int sum(int first, second) { return first + second; }
- C. void sum (int first, int second) { return first + second; }
- D. int sum(int first, int second) { first + second; }
- E. int sum(int first, int second) { return first + second; }
Answer: E
NEW QUESTION # 128
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 0 1 2 3
- B. java MyFile 1 3 2 2
- C. java MyFile 1 2 2 3 4
- D. java MyFile 2 1 2
Answer: B
NEW QUESTION # 129
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/./sys/log
/ server/exe/readme - B. /app/./sys/log
/ readme - C. /app/sys/log
/readme/server/exe - D. /app/log/sys
/ server/exe/readme
Answer: B
NEW QUESTION # 130
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
Function<Integer> funRef = e -> e + 10;
- A. int result = funRef.applyAsInt (value);
ToIntFunction funRef = e -> e + 10; - B. Integer result = funRef.apply (10);
ToIntFunction<Integer> funRef = e -> e + 10; - C. int result = funRef.apply (value);
- D. Integer result = funRef.apply(value);
IntFunction funRef = e -> e + 10;
Answer: D
NEW QUESTION # 131
Given the code fragment:
Which code fragment, when inserted at line 7, enables printing 100?
- A. IntFunction funRef = e -> e + 10;Integer result = funRef.apply (10);
- B. ToIntFunction<Integer> funRef = e -> e + 10;int result = funRef.applyAsInt (value);
- C. Function<Integer> funRef = e -> e + 10;Integer result = funRef.apply(value);
- D. ToIntFunction funRef = e -> e + 10;int result = funRef.apply (value);
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.forEach(System.out::print);
- B. stre.forEachOrdered(System.out::print);
- C. stre.map(a-> a).forEachOrdered(System.out::print);
- D. stre.map(a-> a.techName).forEach(System.out::print);
Answer: D
NEW QUESTION # 133
Given the code fragment:
What is the result?
- A. [Java, J2EE, J2ME, JSTL, JSP]
- B. A compilation error occurs.
- C. [Java, J2EE, J2ME, JSTL]
- D. null
Answer: B
NEW QUESTION # 134
......
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