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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1
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, then exits normally.
B. It prints "Task is complete" twice and throws an exception.
C. It prints "Task is complete" once, then exits normally.
D. It prints "Task is complete" once and throws an exception.
E. It exits normally without printing anything to the console.

Question #2
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A. 0 1 2
B. Compilation fails.
C. 1 2 3 4
D. 1 2 3
E. An exception is thrown.
F. 0 1 2 3

Question #3
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.execute(task2);
B. execService.execute(task1);
C. execService.submit(task1);
D. execService.call(task1);
E. execService.run(task2);
F. execService.submit(task2);
G. execService.call(task2);
H. execService.run(task1);

Question #4
Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A. var b = 2, c = 3.0;
B. var f = { 6 };
C. var a = 1;(Valid: var correctly infers int)
D. var d[] = new int[4];
E. var e;
F. var h = (g = 7);

Question #5
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A. RuntimeException
B. Compilation fails
C. IOException
D. ArithmeticException

Solutions: