Oracle Java SE 21 Developer Professional : 1z0-830 Exam Questions

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 2 only
B) Line 2 and line 3
C) The program successfully compiles
D) Line 1 only
E) Line 1 and line 3
F) Line 3 only
G) Line 1 and line 2

2. Which two of the following aren't the correct ways to create a Stream?

A) Stream<String> stream = Stream.builder().add("a").build();
B) Stream stream = new Stream();
C) Stream stream = Stream.generate(() -> "a");
D) Stream stream = Stream.of();
E) Stream stream = Stream.empty();
F) Stream stream = Stream.ofNullable("a");

3. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) Compilation fails.
B) null
C) It's an integer with value: 42
D) It's a double with value: 42
E) It's a string with value: 42
F) It throws an exception at runtime.

4. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [c, b]
B) [d, b]
C) An UnsupportedOperationException is thrown
D) [d]
E) An IndexOutOfBoundsException is thrown
F) [a, b]

5. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) Compilation fails.
B) {}
C) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) An exception is thrown at runtime.

Solutions: