1z1-809無料問題集「Oracle Java SE 8 Programmer II」

質問 1

Given the code fragment:

and the information:
* The required database driver is configured in the classpath.
* The appropriate database is accessible with the dbURL, username, and passWord exists.
What is the result?

（A）A SQLException is thrown at runtime.

（B）The program prints nothing.

（C）A ClassNotFoundException is thrown at runtime.

（D）The program prints Connection Established.

正解：D 解答を投票する

質問 2

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 animal = (Integer n) - > System.out.println(n);animal.run (100);Moveable.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<Integer> animal = n - > n + 10;animal.run(100);animal.walk (20);

正解：B 解答を投票する

質問 3

Given the content of the files:

Given the code fragment from the Test. java file:

What is the result?

（A）A MissingResourceException is thrown at run time.

（B）Hi!

（C）Compilation fails at line 14.

（D）Have a nice day!

正解：C 解答を投票する

質問 4

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）The program prints employee IDs.

（C）The program prints customer IDs.

（D）compilation fails on line 13.

正解：A 解答を投票する

質問 5

Given:
final class Folder {//line n1
//line n2
public void open () {
System.out.print("Open");
}
}
public class Test {
public static void main (String [] args) throws Exception {
try (Folder f = new Folder()) {
f.open();
}
}
}
Which two modifications enable the code to print Open Close? (Choose two.)

（A）At line n2, insert:final void close () {System.out.print("Close");}

（B）Replace line n1 with:class Folder extends Exception {

（C）Replace line n1 with:class Folder extends Closeable {

（D）Replace line n1 with:class Folder implements AutoCloseable {

（E）At line n2, insert:public void close () throws IOException {System.out.print("Close");}

正解：D、E 解答を投票する

質問 6

Given the EMPLOYEE table;

Given the code fragment:

Assuming the database supports scrolling and updating, what is the result?

（A）A new record is inserted and Employee Id: 102, Employee Name: Peter is displayed.

（B）A new record is inserted and Employee Id: 104, Employee Name: Michael is displayed.

（C）A compilation error occurs.

（D）The program throws a runtime exception at Line 1.

正解：A 解答を投票する

質問 7

Given the definition of the Vehicle class:
class Vehicle {
String name;
void setName (String name) {
this.name = name;
}
String getName() {
return name;
}
}
Which action encapsulates the Vehicle class?

（A）Make the name variable public.

（B）Make the setName method public.

（C）Make the getName method private.

（D）Make the name variable private.

（E）Make the Vehicle class public.

（F）Make the setName method private.

正解：D 解答を投票する

質問 8

Given:
class Worker extends Thread {
CyclicBarrier cb;
public Worker(CyclicBarrier cb) { this.cb = cb; }
public void run () {
try {
cb.await();
System.out.println("Worker...");
} catch (Exception ex) { }
}
}
class Master implements Runnable { //line n1
public void run () {
System.out.println("Master...");
}
}
and the code fragment:
Master master = new Master();
//line n2
Worker worker = new Worker(cb);
worker.start();
You have been asked to ensure that the run methods of both the Worker and Master classes are executed.
Which modification meets the requirement?

（A）At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);

（B）At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);

（C）Replace line n1 with class Master extends Thread {

（D）At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);

正解：B 解答を投票する

質問 9

Given the code fragments:

and

What is the result?

（A）FranceNot Found

（B）FranceOptional[NotFound]

（C）Optional [France]Optional [NotFound]

（D）Optional[France]Not Found

正解：A 解答を投票する

質問 10

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）java
public class ProductCode {
private String code;
public ProductCode(String code) {
this.code = code;
}
}

（B）java
public class ProductCode {
private String code;
private ProductCode(String code) {
this.code = code;
}
}

（C）java
public class ProductCode {
private String code;
public ProductCode() {
this.code = "default";
}
}

（D）java
public class ProductCode {
private String code;
public ProductCode(String code) {
if (code == null) {
throw new IllegalArgumentException("Code cannot be null");
}
this.code = code;
}
}

正解：B 解答を投票する

質問 11

Given:

Which two interfaces can you use to create lambda expressions? (Choose two.)

（A）R

（B）P

（C）Q

（D）U

（E）S

（F）T

正解：B、E 解答を投票する

質問 12

Given the code fragments:
class MyThread implements Runnable {
private static AtomicInteger count = new AtomicInteger (0);
public void run () {
int x = count.incrementAndGet();
System.out.print (x+" ");
}
}
and
Thread thread1 = new Thread(new MyThread());
Thread thread2 = new Thread(new MyThread());
Thread thread3 = new Thread(new MyThread());
Thread [] ta = {thread1, thread2, thread3};
for (int x= 0; x < 3; x++) {
ta[x].start();
}
Which statement is true?

（A）The program prints 1 2 3 and the order is unpredictable.

（B）The program prints 1 2 3.

（C）A compilation error occurs.

（D）The program prints 1 1 1.

正解：A 解答を投票する

質問 13

Given:

and the code fragment:

Assuming candlist contains Candidate objects, which code fragment calculates the average age of candidates from NewYork?

（A）

（B）

（C）

（D）

正解：C 解答を投票する

質問 14

Given the code fragment:
Path file = Paths.get ("courses.txt");
// line n1
Assume the courses.txt is accessible.
Which code fragment can be inserted at line n1 to enable the code to print the content of the courses.txt file?

（A）List<String> fc = Files.readAllLines(file);fc.stream().forEach (s -> System.out.println(s));

（B）List<String> fc = Files.list(file);fc.stream().forEach (s -> System.out.println(s));

（C）Stream<String> fc = Files.readAllLines (file);fc.forEach (s - > System.out.println(s));

（D）Stream<String> fc = Files.list (file);fc.forEach (s -> System.out.println(s));

正解：A 解答を投票する

1z1-809 無料問題集「Oracle Java SE 8 Programmer II」

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