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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var f = { 6 };
B) var d[] = new int[4];
C) var a = 1;(Valid: var correctly infers int)
D) var e;
E) var h = (g = 7);
F) var b = 2, c = 3.0;

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

3. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) Compilation fails.
B) {}
C) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) An exception is thrown at runtime.

4. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) oos.writeObject("Today");
B) fos.write("Today");
C) fos.writeObject("Today");
D) oos.write("Today");

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

Solutions: