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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following can be the body of a lambda expression?

A) Two expressions
B) None of the above
C) A statement block
D) An expression and a statement
E) Two statements

2. 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) [c, b]
B) [a, b]
C) An UnsupportedOperationException is thrown
D) [d]
E) [d, b]
F) An IndexOutOfBoundsException is thrown

3. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) =US-UK
B) US-UK
C) An exception is thrown.
D) -US=UK
E) Compilation fails.
F) US=UK

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of();
B) Stream stream = Stream.generate(() -> "a");
C) Stream stream = Stream.ofNullable("a");
D) Stream stream = Stream.empty();
E) Stream stream = new Stream();
F) Stream<String> stream = Stream.builder().add("a").build();

5. 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) An exception is thrown at runtime.
C) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
D) Compilation fails.

Solutions: