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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A. None of the propositions
B. java
String colors = """
red \
green\
blue \
""";
C. java
String colors = """
red
green
blue
""";
D. java
String colors = """
red \s
green\s
blue \s
""";
E. java
String colors = """
red \t
green\t
blue \t
""";

Question 2

Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A. A ClassCastException is thrown.
B. false
C. Compilation fails.
D. true
E. A NullPointerException is thrown.

Question 3

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

Question 4

Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?

A. It prints "Task is complete" twice and throws an exception.
B. It exits normally without printing anything to the console.
C. It prints "Task is complete" once and throws an exception.
D. It prints "Task is complete" twice, then exits normally.
E. It prints "Task is complete" once, then exits normally.

Question 5

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

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

Solutions: