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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) Compilation fails
C) default
D) nothing

2. Which of the following can be the body of a lambda expression?

A) None of the above
B) Two statements
C) A statement block
D) An expression and a statement
E) Two expressions

3. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 42
B) 42 42
C) Compilation fails
D) 666 666

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

5. 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) The unnamed module exports all of its packages.
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) Code in an explicitly named module can access types in the unnamed module.

Solutions: