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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which methods compile?

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

2. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) UnitedStates
B) United-STATES
C) -UnitedSTATES
D) -UNITEDSTATES
E) United-States
F) UNITED-STATES
G) -UnitedStates

3. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) null
B) Compilation fails
C) Optional[Java]
D) Java

4. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) Compilation fails.
B) bread:Baguette, dish:Frog legs, cheese.
C) bread:Baguette, dish:Frog legs, no cheese.
D) bread:bread, dish:dish, cheese.

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

Solutions: