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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It throws an exception.
B) It prints all elements, but changes made during iteration may not be visible.
C) Compilation fails.
D) It prints all elements, including changes made during iteration.

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

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

4. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:bread, dish:dish, cheese.
B) Compilation fails.
C) bread:Baguette, dish:Frog legs, cheese.
D) bread:Baguette, dish:Frog legs, no cheese.

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

Solutions: