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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
B) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6

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

3. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 1
B) Compilation fails.
C) It throws an exception at runtime.
D) 2
E) 0

4. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C
B) Compilation error
C) IllegalArgumentException
D) home
E) C:

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

Solutions: