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Oracle Java SE 8 Programmer II Sample Questions (Q55-Q60):

NEW QUESTION # 55
Given the code fragment:
Stream<Path> files = Files.walk(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. All files and directories under the home directory are listed along with their attributes.
C. The files in the home directory are listed along with their attributes.
D. A compilation error occurs at line n2.

Answer: B

NEW QUESTION # 56
Given the code fragment:
List<Integer> list1 = Arrays.asList(10, 20);
List<Integer> list2 = Arrays.asList(15, 30);
//line n1
Which code fragment, when inserted at line n1, prints 10 20 15 30?

A. Stream.of(list1, list2)
. flatMapToInt(list -> list.stream())
. forEach(s -> System.out.print(s + " "));
B. Stream.of(list1, list2)
. flatMap(list -> list.stream())
. forEach(s -> System.out.print(s + " "));
C. Stream.of(list1, list2)
. flatMap(list -> list.intStream())
. forEach(s -> System.out.print(s + " "));
D. list1.stream()
. flatMap(list2.stream().flatMap(e1 -> e1.stream())
. forEach(s -> System.out.println(s + " "));

Answer: B

NEW QUESTION # 57
The data.doc, data.txt and data.xml files are accessible and contain text.
Given the code fragment:
Stream<Path> paths = Stream.of (Paths. get("data.doc"),
Paths. get("data.txt"),
Paths. get("data.xml"));
paths.filter(s-> s.toString().endWith("txt")).forEach(
s -> {
try {
Files.readAllLines(s)
.stream()
.forEach(System.out::println); //line n1
} catch (IOException e) {
System.out.println("Exception");
}
}
);
What is the result?

A. A compilation error occurs at line n1.
B. The program prints the content of data.txt file.
C. The program prints the content of the three files.
D. The program prints:Exception<<The content of the data.txt file>>Exception

Answer: B

NEW QUESTION # 58
Given:
public enum USCurrency {
PENNY (1),
NICKLE(5),
DIME (10),
QUARTER(25);
private int value;
public USCurrency(int value) {
this.value = value;
}
public int getValue() {return value;}
}
public class Coin {
public static void main (String[] args) {
USCurrency usCoin =new USCurrency.DIME;
System.out.println(usCoin.getValue()):
}
}
Which two modifications enable the given code to compile?

A. Add the finalkeyword in the declaration of value.
B. Nest the USCurrencyenumeration declaration within the Coinclass.
C. Remove the newkeyword from the instantion of usCoin.
D. Make the getter method of valueas a staticmethod.
E. Make the USCurrencyenumeration constructor private.

Answer: A,B

NEW QUESTION # 59
Which statement is true about the single abstract method of the java.util.function.Function interface?

A. It accepts one argument and always produces a result of the same type as the argument.
B. It accepts one argument and returns boolean.
C. It accepts an argument and produces a result of any data type.
D. It accepts one argument and returns void.

Answer: A

Explanation:
Explanation/Reference:
Reference: http://winterbe.com/posts/2014/03/16/java-8-tutorial/ (functions)

NEW QUESTION # 60
......

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