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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5

2. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) Compilation fails
B) [Lille, Lyon]
C) [Lyon, Lille, Toulouse]
D) [Paris]
E) [Paris, Toulouse]

3. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) It throws an exception at runtime.
B) Compilation fails.
C) long
D) nothing
E) integer
F) string

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

5. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'final' modifier with all kinds of classes
D) You can use 'public' access modifier with all kinds of classes
E) You can use 'protected' access modifier with all kinds of classes

Solutions: