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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Nothing
B) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
C) An exception is thrown at runtime.
D) Compilation fails.

2. 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) array4
B) array2
C) array3
D) array5
E) array1

3. Which of the following statements is correct about a final class?

A) It cannot implement any interface.
B) It cannot be extended by any other class.
C) It must contain at least a final method.
D) It cannot extend another class.
E) The final keyword in its declaration must go right before the class keyword.

4. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 0
B) Optional.empty
C) 1
D) Compilation fails
E) Optional[1]
F) An exception is thrown
G) 2

5. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) An exception is thrown.
B) abc
C) ABC
D) Compilation fails.

Solutions: