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1. 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) None of the suggestions.
D) var concurrentHashMap = new ConcurrentHashMap();
E) var concurrentHashMap = new ConcurrentHashMap(42, 10);
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) [Lyon, Lille, Toulouse]
B) [Paris]
C) [Paris, Toulouse]
D) Compilation fails
E) [Lille, Lyon]
3. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
A) C
B) home
C) IllegalArgumentException
D) C:
E) Compilation error
4. 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) Beaujolais Nouveau, Chablis, Saint-Emilion
C) Saint-Emilion
D) Rose
5. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
A) 012
B) Compilation fails
C) An exception is thrown
D) Nothing
E) 01
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: E | Question # 3 Answer: B | Question # 4 Answer: B | Question # 5 Answer: E |
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