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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Which two of the following aren't the correct ways to create a Stream?

A. Stream<String> stream = Stream.builder().add("a").build();
B. Stream stream = Stream.generate(() -> "a");
C. Stream stream = new Stream();
D. Stream stream = Stream.of("a");
E. Stream stream = Stream.empty();
F. Stream stream = Stream.of();
G. Stream stream = Stream.ofNullable("a");

Question 2

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

Question 3

Which of the following java.io.Console methods doesnotexist?

A. readLine(String fmt, Object... args)
B. readPassword()
C. reader()
D. readLine()
E. read()
F. readPassword(String fmt, Object... args)

Question 4

Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
B. An exception is thrown at runtime.
C. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
D. {}
E. Compilation fails.

Question 5

Which methods compile?

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

Solutions: