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

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

3. 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

4. Which of the following doesnotexist?

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

5. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?