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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 666 42
B) 666 666
C) Compilation fails
D) 42 42

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

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

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

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

5. 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

Solutions: