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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are disabled and the input argument is null
B) A NullPointerException is never thrown
C) Only if assertions are enabled and the input argument is null
D) Only if assertions are enabled and the input argument isn't null
E) Only if assertions are disabled and the input argument isn't null

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

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

4. Which of the following java.io.Console methods doesnotexist?

A) readPassword(String fmt, Object... args)
B) readLine(String fmt, Object... args)
C) read()
D) readPassword()
E) reader()
F) readLine()

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) IOException
B) RuntimeException
C) Compilation fails
D) ArithmeticException

Solutions: