1z0-809 試験問題を無料オンラインアクセス

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.246
• B.A compilation error occurs at line n1.
• C.The code produces no output.
• D.A compilation error occurs at line n2.

Given that these files exist and are accessible:

and given the code fragment:

Which code fragment can be inserted at line n1 to enable the code to print only /company/emp?

• A.Stream<Path> stream = Files.find(Paths.get ("/company"), 1,(p,b) -> b.isDirectory (), FileVisitOption.
  FOLLOW_LINKS);
• B.Stream<Path> stream = Files.list (Paths.get ("/company/emp"));
• C.Stream<Path> stream = Files.walk (Paths.get ("/company"));
• D.Stream<Path> stream = Files.list (Paths.get ("/company"));

Given:
class ImageScanner implements AutoCloseable {
public void close () throws Exception {
System.out.print ("Scanner closed.");
}
public void scanImage () throws Exception {
System.out.print ("Scan.");
throw new Exception("Unable to scan.");
}
}
class ImagePrinter implements AutoCloseable {
public void close () throws Exception {
System.out.print ("Printer closed.");
}
public void printImage () {System.out.print("Print."); }
}
and this code fragment:
try (ImageScanner ir = new ImageScanner();
ImagePrinter iw = new ImagePrinter()) {
ir.scanImage();
iw.printImage();
} catch (Exception e) {
System.out.print(e.getMessage());
}
What is the result?

• A.Scan. Unable to scan.
• B.Scan. Unable to scan. Printer closed.
• C.Scan.Scanner closed. Unable to scan.
• D.Scan.Printer closed. Scanner closed. Unable to scan.

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 compare (Person p1, Person p2) {return p1.name.compareTo (p2.name);}
• B.Replace line n1 withclass Person implements Comparator<Person>
• C.At line n2 insert:public int compareTo (Person p, Person p2) {return p1.name.compareTo (p2.name);}
• D.At line n2 insertpublic int compareTo (Person p) {return this.name.compareTo (p.name);}
• E.Replace line n1 withclass Person implements Comparable<Person>
• F.Replace line n1 withclass Person extends Comparator<Person>

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().max(Integer : : max).get()
• B.nums.stream().map(a -> a).max()
• C.nums.stream().max()
• D.nums.stream().max(Comparator.comparing(a -> a)).get()