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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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

Question 2

Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A. 2
B. 1
C. 0
D. An exception is thrown
E. Compilation fails
F. Optional[1]
G. Optional.empty

Question 3

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. WithStaticField
B. WithInstanceField
C. ImplementingInterface
D. ExtendingClass

Question 4

Which of the following statements is correct about a final class?

A. It cannot implement any interface.
B. It cannot extend another class.
C. It must contain at least a final method.
D. It cannot be extended by any other class.
E. The final keyword in its declaration must go right before the class keyword.

Question 5

Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A. Jeanne
B. MissingResourceException
C. James
D. Compilation fails
E. JamesJeanne
F. JeanneJames

Solutions: