Oracle : 1z1-830 Questions & Answers

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=1, b=2, a=3}
B) {b=1, c=2, a=3}
C) {b=1, a=3, c=2}
D) {a=3, b=1, c=2}
E) {a=1, b=2, c=3}
F) {c=2, a=3, b=1}
G) Compilation fails

2. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) True
B) False

3. Which of the following doesnotexist?

A) DoubleSupplier
B) Supplier<T>
C) BooleanSupplier
D) BiSupplier<T, U, R>
E) LongSupplier
F) They all exist.

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, then exits normally.
D) It prints "Task is complete" twice, then exits normally.
E) It prints "Task is complete" once and throws an exception.

5. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 42
B) 42 42
C) 666 666
D) Compilation fails

Solutions: