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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 14
B) 12
C) 11
D) 10

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

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

3. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) _$
B) 10
C) It throws an exception.
D) Compilation fails.

4. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) A a = new A();
B) B b = new B();
C) A a = new Test().new A();
D) B b = new Test().new B();
E) A a = new Test.A();
F) B b = new Test.B();

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

Solutions: