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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) oos.writeObject("Today");
B) fos.write("Today");
C) fos.writeObject("Today");
D) oos.write("Today");

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

3. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Saint-Emilion
B) Beaujolais Nouveau, Chablis, Saint-Emilion
C) Rose
D) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion

4. 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: 16, Final value of post: 6, Final value of pre: 6
B) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
D) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6

5. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'protected' access modifier with all kinds of classes
C) None
D) You can use 'private' access modifier with all kinds of classes
E) You can use 'public' access modifier with all kinds of classes

Solutions: