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

質問 1

Given the code fragment:

Which should be inserted into line n1 to print Average = 2.5?

（A）IntStream str = IntStream.of (1, 2, 3, 4);

（B）IntStream str = Stream.of (1, 2, 3, 4);

（C）Stream str = Stream.of (1, 2, 3, 4);

（D）DoubleStream str = Stream.of (1.0, 2.0, 3.0, 4.0);

正解：D 解答を投票する

質問 2

Given the code fragment:
Path path1 = Paths.get("/app/./sys/");
Path res1 = path1.resolve("log");
Path path2 = Paths.get("/server/exe/");
Path res1 = path2.resolve("/readme/");
System.out.println(res1);
System.out.println(res2);
What is the result?

（A）/app/log/sys/server/exe/readme

（B）/app/./sys/log/readme

（C）/app/sys/log/readme/server/exe

（D）/app/./sys/log/server/exe/readme

正解：D 解答を投票する

質問 3

Given the code fragment:
List<String> str = Arrays.asList ("my", "pen", "is", "your', "pen");
Predicate<String> test = s -> {
int i = 0;
boolean result = s.contains ("pen");
System.out.print(i++) + ":");
return result;
};
str.stream()
.filter(test)
.findFirst()
.ifPresent(System.out ::print);
What is the result?

（A）0 : 0 : 0 : 0 : 0 : pen

（B）0 : 1 : pen

（C）0 : 0 : pen

（D）A compilation error occurs.

（E）0 : 1 : 2 : 3 : 4 :

正解：C 解答を投票する

質問 4

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 5

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）The Test.java file fails to compile.

（B）Read Java ProgrammingView http:/ ebook.com/ebook

（C）Read Java ProgrammingRead http:/ ebook.com/ebook

（D）The EBook.java file fails to compile.

正解：A 解答を投票する

質問 6

Given that data.txt and alldata.txt are accessible, and the code fragment:

What is required at line n1 to enable the code to overwrite alldata.txt with data.txt?

（A）br.flush();

（B）bw.writeln();

（C）br.close();

（D）bw.flush();

正解：D 解答を投票する

質問 7

Given the code fragments:

and

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

（A）Replace line n1 withclass Person implements Comparable<Person>

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

（C）Replace line n1 withclass Person implements Comparator<Person>

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

（E）Replace line n1 withclass Person extends Comparator<Person>

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

正解：A、B 解答を投票する

質問 8

Given the code fragment:
Stream<Path> files = Files.list(Paths.get(System.getProperty("user.home"))); files.forEach (fName -> {//line n1 try { Path aPath = fName.toAbsolutePath();//line n2 System.out.println(fName + ":"
+ Files.readAttributes(aPath, Basic.File.Attributes.class).creationTime ());
} catch (IOException ex) {
ex.printStackTrace();
});
What is the result?

（A）A compilation error occurs at line n1.

（B）A compilation error occurs at line n2.

（C）All files and directories under the home directory are listed along with their attributes.

（D）The files in the home directory are listed along with their attributes.

正解：D 解答を投票する

質問 9

Given the code fragment:
List<String> colors = Arrays.asList("red", "green", "yellow");
Predicate<String> test = n - > {
System.out.println("Searching...");
return n.contains("red");
};
colors.stream()
.filter(c -> c.length() > 3)
.allMatch(test);
What is the result?

（A）Searching...

（B）Searching...Searching...Searching...

（C）Searching...Searching...

（D）A compilation error occurs.

正解：A 解答を投票する

質問 10

Given the code fragment:

Which code fragment, when inserted at line 7, enables printing 100?

（A）Function<Integer> funRef = e -> e + 10;Integer result = funRef.apply(value);

（B）IntFunction funRef = e -> e + 10;Integer result = funRef.apply (10);

（C）ToIntFunction<Integer> funRef = e -> e + 10;int result = funRef.applyAsInt (value);

（D）ToIntFunction funRef = e -> e + 10;int result = funRef.apply (value);

正解：A 解答を投票する

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

弊社を連絡する

関連リンク

トップ試験