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Oracle Java SE 21 Developer Professional Sample Questions:

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

A) Code in an explicitly named module can access types in the unnamed module.
B) The unnamed module exports all of its packages.
C) 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.
D) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
E) The unnamed module can only access packages defined in the unnamed module.
F) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.

2. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithInstanceField
B) WithStaticField
C) ExtendingClass
D) ImplementingInterface

3. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) D
B) B
C) E
D) C
E) None of the above
F) A

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 3
B) Line 3 only
C) The program successfully compiles
D) Line 2 only
E) Line 1 and line 2
F) Line 2 and line 3
G) Line 1 only

5. Which methods compile?

A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
D) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp

Solutions: