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Oracle Java SE 21 Developer Professional Sample Questions:
1. Which two of the following aren't the correct ways to create a Stream?
A) Stream stream = Stream.ofNullable("a");
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.of();
D) Stream stream = Stream.empty();
E) Stream stream = new Stream();
F) Stream stream = Stream.generate(() -> "a");
2. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel Dior Louis Vuitton
C) Chanel
D) Compilation fails.
3. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
A) MMMM dd
B) MMM dd
C) MM dd
D) MM d
4. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
A) array1
B) array2
C) array5
D) array3
E) array4
5. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?
A) [d, b]
B) [a, b]
C) An IndexOutOfBoundsException is thrown
D) [d]
E) [c, b]
F) An UnsupportedOperationException is thrown
Solutions:
| Question # 1 Answer: B,E | Question # 2 Answer: C | Question # 3 Answer: A | Question # 4 Answer: A,C | Question # 5 Answer: E |
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