Oracle Java SE 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) SmartPhone interface does not compile
B) Iphone15 class does not compile
C) An exception is thrown at running Iphone15.ring();
D) Everything compiles

2. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.run(task2);
B) execService.call(task2);
C) execService.submit(task2);
D) execService.call(task1);
E) execService.execute(task1);
F) execService.execute(task2);
G) execService.submit(task1);
H) execService.run(task1);

3. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Saint-Emilion
B) Rose
C) Beaujolais Nouveau, Chablis, Saint-Emilion
D) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion

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

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

5. 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) ImplementingInterface
C) ExtendingClass
D) WithInstanceField

Solutions: