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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) Compilation fails
B) ok the 2024-07-10T07:17:45.523939600
C) ok the 2024-07-10
D) An exception is thrown

3. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) acb
C) cbca
D) bca
E) bac
F) abc
G) cba

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

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

Solutions: