Oracle Java SE 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #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

Question #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);

Question #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

Question #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)

Question #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: