1z1-809試験無料問題集（195題）「Oracle Java SE 8 Programmer II 認定」

出題：1

Given the code fragment:
List<Integer> values = Arrays.asList (1, 2, 3);
values.stream ()
.map(n -> n*2)//line n1
.peek(System.out::print)//line n2
.count();
What is the result?

A. A compilation error occurs at line n1.

B. The code produces no output.

C. A compilation error occurs at line n2.

D. 246

正解：D 解答を投票する

出題：2

Given:

and the code fragment:

Which definition of the ColorSorter class sorts the blocks list?

A. Option D

B. Option C

C. Option A

D. Option B

正解：B 解答を投票する

出題：3

Given the code fragments:

and

Which two modifications enable to sort the elements of the emps list? (Choose two.)

A. At line n2 insertpublic int compareTo (Person p) {return this.name.compareTo (p.name);}

B. At line n2 insert:public int compareTo (Person p, Person p2) {return p1.name.compareTo (p2.name);}

C. At line n2 insertpublic int compare (Person p1, Person p2) {return p1.name.compareTo (p2.name);}

D. Replace line n1 withclass Person implements Comparable<Person>

E. Replace line n1 withclass Person implements Comparator<Person>

F. Replace line n1 withclass Person extends Comparator<Person>

正解：A,D 解答を投票する

出題：4

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：5

Given the code fragments:

and

What is the result?

A. Video played.Game played.

B. A compilation error occurs.

C. class java.io.IOException

D. class java.lang.Exception

正解：D 解答を投票する

出題：6

Given the code fragment:
class CallerThread implements Callable<String> {
String str;
public CallerThread(String s) {this.str=s;}
public String call() throws Exception {
return str.concat("Call");
}
}
and
public static void main (String[] args) throws InterruptedException, ExecutionException
{
ExecutorService es = Executors.newFixedThreadPool(4); //line n1
Future f1 = es.submit (newCallerThread("Call"));
String str = f1.get().toString();
System.out.println(str);
}
Which statement is true?

A. The program prints Call Call and terminates.

B. A compilation error occurs at line n1.

C. The program prints Call Call and does not terminate.

D. An ExecutionException is thrown at run time.

正解：C 解答を投票する

出題：7

Given the code fragments:
class ThreadRunner implements Runnable {
public void run () { System.out.print ("Runnable") ; }
}
class ThreadCaller implements Callable {
Public String call () throws Exception {return "Callable"; )
}
and
ExecutorService es = Executors.newCachedThreadPool ();
Runnable r1 = new ThreadRunner ();
Callable c1 = new ThreadCaller ();
// line n1
es.shutdown();
Which code fragment can be inserted at line n1 to start r1 and c1 threads?

A. Future<String> f1 = (Future<String>) es.execute(r1);Future<String> f2 = (Future<String>) es.execute(c1);

B. Future<String> f1 = (Future<String>) es.submit (r1);es.execute (c1);

C. es.execute (r1);Future<String> f1 = es.execute (c1) ;

D. es.submit(r1);Future<String> f1 = es.submit (c1);

正解：D 解答を投票する

出題：8

Given that these files exist and are accessible:
/sports/info.txt
/sports/cricket/players.txt
/sports/cricket/data/ODI.txt
and given the code fragment:
int maxDepth =2;
Stream<Path> paths = Files.find(Paths.get("/sports"),
maxDepth,
(p, a) -> p.getFileName().toString().endsWith ("txt"),
FileVisitOption.FOLLOW_LINKS);
Long fCount = paths.count();
System.out.println(fCount);
Assuming that there are NO soft-link/symbolic links to any of the files in the directory structure, what is the result?

A. An Exception is thrown at runtime.

B. 2

C. 1

D. 3

正解：A 解答を投票する

出題：9

Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

A. You want to share code among several closely related classes.

B. You expect that unrelated classes would implement your interfaces.

C. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.

D. You want to take advantage of multiple inheritance of type.

E. You want to declare non-static on non-final fields.

正解：B,D 解答を投票する

出題：10

Given:
Book.java:
public class Book {
private String read(String bname) { return "Read" + bname }
}
EBook.java:
public class EBook extends Book {
public class String read (String url) { return "View" + url }
}
Test.java:
public class Test {
public static void main (String[] args) {
Book b1 = new Book();
b1.read("Java Programing");
Book b2 = new EBook();
b2.read("http://ebook.com/ebook");
}
}
What is the result?

A. Read Java ProgrammingRead http:/ ebook.com/ebook

B. The Test.java file fails to compile.

C. Read Java ProgrammingView http:/ ebook.com/ebook

D. The EBook.java file fails to compile.

正解：B 解答を投票する

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