1z0-809 Exam Practice Questions prepared by Oracle Professionals
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NEW QUESTION # 33
Which statement is true about the single abstract method of the java.util.function.Function interface?
- A. It accepts one argument and returns void.
- B. It accepts an argument and produces a result of any data type.
- C. It accepts one argument and always produces a result of the same type as the argument.
- D. It accepts one argument and returns boolean.
Answer: C
Explanation:
Explanation/Reference:
Reference: http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)
NEW QUESTION # 34
Given the code fragment:
What is the result?
- A. 0
- B. AnArrayIndexOutOfBoundsException is thrown at runtime
- C. Compilation fails
- D. 1
- E. 2
Answer: A
NEW QUESTION # 35
For which three objects must a vendor provide implementations in its JDBC driver?
- A. Date
- B. Time
- C. DriverManager
- D. Connection
- E. Statement
- F. SQLException
- G. ResultSet
Answer: D,E,G
Explanation:
Explanation/Reference:
Explanation:
Database vendors support JDBC through the JDBC driver interface or through the ODBC connection.
Each driver must provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement, java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by the generic java.sql.DriverManager interface.
NEW QUESTION # 36
Given the code fragment:
What is the result?
- A. Compilation fails.
- B. A B C Work done
- C. A B C D Work done
- D. A Work done
Answer: D
NEW QUESTION # 37
Given the code fragment:
Stream<List<String>> iStr= Stream.of (
Arrays.asList ("1", "John"),
Arrays.asList ("2", null)0;
Stream<<String> nInSt = iStr.flatMapToInt ((x) -> x.stream ());
nInSt.forEach (System.out :: print);
What is the result?
- A. 0
- B. 1John2null
- C. A NullPointerExceptionis thrown at run time.
- D. A compilation error occurs.
Answer: C
NEW QUESTION # 38
Given the code fragment:
What is the result?
- A. A B C D
- B. A B D C
- C. A B C C
- D. A C D
- E. A B D
Answer: C
NEW QUESTION # 39
Which three statements describe the object-oriented features of the Java language?
- A. Objects cannot be reused.
- B. A subclass can inherit from a superclass.
- C. Objects can share behaviors with other objects.
- D. object. is the root class of all other objects.
- E. A package must contain more than one class.
- F. A main method must be declared in every class.
Answer: B,C,F
NEW QUESTION # 40
Given:
- A. ns = 50 S = 50 ns = 125 S = 125 ns = 100 S = 100
- B. ns = 50 S = 125 ns = 125 S = 125 ns = 100 S = 125
- C. ns = 50 S = 50 ns = 125 S = 125 ns = 0 S = 125
- D. ns = 50 S = 125 ns = 125 S = 125 ns = 0 S = 125
Answer: D
NEW QUESTION # 41
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?
/app/sys/log
- A. /readme/server/exe
/app/log/sys - B. /server/exe/readme
/app/./sys/log - C. /server/exe/readme
- D. /readme
/app/./sys/log
Answer: D
NEW QUESTION # 42
Given the code fragment:
You have been asked to define the ProductCode class. The definition of the ProductCode class must allow c1 instantiation to succeed and cause a compilation error on c2 instantiation.
Which definition of ProductCode meets the requirement?
- A. Option A
- B. Option D
- C. Option C
- D. Option B
Answer: D
NEW QUESTION # 43
Given:
What is the result?
- A. Compilation fails
- B. Red 0 Orange 0 Green 3
- C. Red 0 Orange 0 Green 6
- D. Red 0 Orange 1
- E. Green 4
Answer: A
NEW QUESTION # 44
Given the code fragment:
What is the result?
- A. A compilation error occurs at line n2.
- B. A compilation error occurs at line n1.
- C. 0
- D. 1
Answer: A
NEW QUESTION # 45
Given the code fragment:
What is the result?
- A. 4000 : 1000
- B. 4000 : 2000
- C. 1000 : 4000
- D. 1000 : 2000
Answer: A
NEW QUESTION # 46
Given that version.txtis accessible and contains:
1234567890
and given the code fragment:
What is the result?
- A. 0
- B. 1
- C. The program prints nothing.
- D. 2
Answer: B
NEW QUESTION # 47
Given the code fragment:
Assume that the value of now is 6:30 in the morning.
What is the result?
- A. An exception is thrown at run time.
- B. 0
- C. 1
- D. 2
Answer: B
NEW QUESTION # 48
Given:
and the code fragment:
What is the result?
true
- A. false
- B. true
false - C. true
false - D. false
true
Answer: A
NEW QUESTION # 49
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 n1 to enable the code to print the maximum number in the nums list?
- A. nums.stream().map(a -> a).max()
- B. nums.stream().max(Comparator.comparing(a -> a)).get()
- C. nums.stream().max(Integer : : max).get()
- D. nums.stream().max()
Answer: D
NEW QUESTION # 50
Which two statements are true about the Fork/Join Framework? (Choose two.)
- A. The RecursiveTask subclass is used when a task does not need to return a result.
- B. The Fork/Join solution when run on multicore hardware always performs faster than standard sequential solution.
- C. The Fork/Join framework can help you take advantage of multicore hardware.
- D. The Fork/Join framework implements a work-stealing algorithm.
Answer: A,D
Explanation:
References:
NEW QUESTION # 51
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. int i = 0; i < 1; i++
- C. ; i < 1;
- D. int i: array
- E. ; i < 1; i++
Answer: A,B,D
NEW QUESTION # 52
Given the code fragment:
What is the result?
- A. Jesse 25
Walter 52 - B. Compilation fails only at line n1.
- C. Compilation fails at both line n1 and line n2.
- D. Compilation fails only at line n2.
Answer: C
NEW QUESTION # 53
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