Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel Dior Louis Vuitton
B) An ArrayIndexOutOfBoundsException is thrown at runtime.
C) Compilation fails.
D) Chanel

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

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

3. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument is null
B) A NullPointerException is never thrown
C) Only if assertions are disabled and the input argument isn't null
D) Only if assertions are disabled and the input argument is null
E) Only if assertions are enabled and the input argument isn't null

4. Which of the following statements are correct?

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

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

Solutions: