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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which methods compile?

A) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
B) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp

2. 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 'public' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'final' modifier with all kinds of classes

3. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
B) var concurrentHashMap = new ConcurrentHashMap(42);
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) None of the suggestions.

4. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {b=1, c=2, a=3}
B) {b=1, a=3, c=2}
C) {c=2, a=3, b=1}
D) Compilation fails
E) {a=3, b=1, c=2}
F) {c=1, b=2, a=3}
G) {a=1, b=2, c=3}

5. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
B) Saint-Emilion
C) Beaujolais Nouveau, Chablis, Saint-Emilion
D) Rose

Solutions: