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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) abc
B) bac
C) cba
D) bca
E) acb
F) cacb
G) cbca

2. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) United-STATES
C) -UnitedStates
D) UNITED-STATES
E) -UNITEDSTATES
F) UnitedStates
G) United-States

3. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) Compilation fails at line n1.
B) markdown
Inner class:
------------
Outer field
C) Nothing
D) An exception is thrown at runtime.
E) Compilation fails at line n2.

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

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

5. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) C
B) B
C) D
D) None of the above
E) E
F) A

Solutions: