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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It throws an exception at runtime.
B) It compiles.
C) It does not compile.

3. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) _$
B) 10
C) Compilation fails.
D) It throws an exception.

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

5. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) -UnitedStates
C) -UNITEDSTATES
D) United-States
E) UnitedStates
F) United-STATES
G) UNITED-STATES

Solutions: