Oracle Java SE 21 Developer Professional : 1z1-830 Exam Questions

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'public' access modifier with all kinds of classes
B) You can use 'final' modifier with all kinds of classes
C) You can use 'private' access modifier with all kinds of classes
D) None
E) You can use 'protected' access modifier with all kinds of classes

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

3. Which of the following methods of java.util.function.Predicate aredefault methods?

A) negate()
B) isEqual(Object targetRef)
C) and(Predicate<? super T> other)
D) test(T t)
E) not(Predicate<? super T> target)
F) or(Predicate<? super T> other)

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

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

5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) IllegalArgumentException
B) Compilation error
C) C
D) home
E) C:

Solutions: