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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 2 2
B) 1 5 5 1
C) 5 5 2 3
D) 1 1 2 3
E) 1 1 1 1

2. Which of the following statements is correct about a final class?

A) It cannot implement any interface.
B) It cannot be extended by any other class.
C) It must contain at least a final method.
D) It cannot extend another class.
E) The final keyword in its declaration must go right before the class keyword.

3. Which three of the following are correct about the Java module system?

A) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
B) The unnamed module can only access packages defined in the unnamed module.
C) Code in an explicitly named module can access types in the unnamed module.
D) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
E) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
F) The unnamed module exports all of its packages.

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

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

5. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel Dior Louis Vuitton
C) Chanel
D) Compilation fails.

Solutions: