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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=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}

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

3. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) markdown
Inner class:
------------
Outer field
B) Nothing
C) Compilation fails at line n2.
D) An exception is thrown at runtime.
E) Compilation fails at line n1.

4. Which of the following isn't a valid option of the jdeps command?

A) --list-reduced-deps
B) --print-module-deps
C) --generate-open-module
D) --check-deps
E) --list-deps
F) --generate-module-info

5. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) true
B) A NullPointerException is thrown.
C) A ClassCastException is thrown.
D) Compilation fails.
E) false

Solutions: