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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithStaticField
B) WithInstanceField
C) ExtendingClass
D) ImplementingInterface

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

5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) An exception is thrown at runtime
B) 3.3
C) true
D) Compilation fails
E) false

Solutions: