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

2. Which of the following methods of java.util.function.Predicate aredefault methods?

A) test(T t)
B) or(Predicate<? super T> other)
C) not(Predicate<? super T> target)
D) negate()
E) and(Predicate<? super T> other)
F) isEqual(Object targetRef)

3. 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

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

5. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) An exception is thrown at runtime
B) 3.3
C) true
D) Compilation fails
E) false

Solutions: