1z0-809試験無料問題集（195題）「Oracle Java SE 8 Programmer II 認定」

出題：1

Which two methods from the java.util.stream.Stream interface perform a reduction operation? (Choose two.)

A. filter ()

B. collect ()

C. peek ()

D. count ()

E. distinct ()

正解：B,D 解答を投票する

出題：2

Given:
IntStream stream = IntStream.of (1,2,3);
IntFunction<Integer> inFu= x -> y -> x*y;//line n1
IntStream newStream = stream.map(inFu.apply(10));//line n2
newStream.forEach(System.out::print);
Which modification enables the code fragment to compile?

A. Replace line n1 with:BiFunction<IntUnaryOperator> inFu = x -> y -> x*y;

B. Replace line n1 with:IntFunction<IntUnaryOperator> inFu = x -> y -> x*y;

C. Replace line n1 with:IntFunction<UnaryOperator> inFu = x -> y -> x*y;

D. Replace line n2 with:IntStream newStream = stream.map(inFu.applyAsInt (10));

正解：B 解答を投票する

出題：3

Which statement is true about the DriverManager class?

A. It executes SQL statements against the database.

B. it is written by different vendors for their specific database.

C. It returns an instance of Connection.

D. It only queries metadata of the database.

正解：C 解答を投票する

解説: (GoShiken メンバーにのみ表示されます)

出題：4

Given:
Item table
* ID, INTEGER: PK
* DESCRIP, VARCHAR(100)
* PRICE, REAL
* QUANTITY< INTEGER
And given the code fragment:
9. try {
10.Connection conn = DriveManager.getConnection(dbURL, username, password);
11. String query = "Select * FROM Item WHERE ID = 110";
12. Statement stmt = conn.createStatement();
13. ResultSet rs = stmt.executeQuery(query);
14.while(rs.next()) {
15.System.out.println("ID:" + rs.getInt("Id"));
16.System.out.println("Description:" + rs.getString("Descrip"));
17.System.out.println("Price:" + rs.getDouble("Price"));
18. System.out.println(Quantity:" + rs.getInt("Quantity"));
19.}
20. } catch (SQLException se) {
21. System.out.println("Error");
22. }
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the dbURL, userName, and passWord exists.
The SQL query is valid.
What is the result?

A. Compilation fails.

B. The code prints information about Item 110.

C. An exception is thrown at runtime.

D. The code prints Error.

正解：B 解答を投票する

出題：5

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).forEachOrdered(System.out::print);

B. stre.forEach(System.out::print);

C. stre.forEachOrdered(System.out::print);

D. stre.map(a-> a.techName).forEach(System.out::print);

正解：D 解答を投票する

出題：6

Given the code fragment:

Assume that the value of now is 6:30 in the morning.
What is the result?

A. 1

B. 60

C. 0

D. An exception is thrown at run time.

正解：B 解答を投票する

出題：7

Given the code fragment:

Which is the valid definition of the Course enum?

A. Option D

B. Option C

C. Option A

D. Option B

正解：A 解答を投票する

出題：8

Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () < 6) {
throw new UserException ();
} else if (age >= 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?

A. User is registered.

B. A UserException is thrown.

C. An AgeOutOfLimitException is thrown.

D. A compilation error occurs in the main method.

正解：C 解答を投票する

出題：9

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. A compilation error occurs in Shop.

B. All classes compile successfully.

C. A compilation error occurs in Cake.

D. A compilation error occurs in IceCream.

E. A compilation error occurs in Bread

正解：E 解答を投票する

出題：10

Given the code fragment:

What is the result?

A. text1text2text2text3

B. [text1, text2]

C. text1

D. text1text2

正解：D 解答を投票する

1z0-809試験無料問題集「Oracle Java SE 8 Programmer II 認定」