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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \s
green\s
blue \s
""";
B) java
String colors = """
red \
green\
blue \
""";
C) java
String colors = """
red \t
green\t
blue \t
""";
D) None of the propositions
E) java
String colors = """
red
green
blue
""";

2. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 1
B) It's either 1 or 2
C) It's either 0 or 1
D) It's always 2
E) Compilation fails

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

4. Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A) An exception is thrown at runtime.
B) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
C) arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
D) Compilation fails.
E) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00

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

Solutions: