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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) File f1.txt exists while file f2.txt doesn't
B) Neither files f1.txt nor f2.txt exist
C) An exception is always thrown
D) Both files f1.txt and f2.txt exist
E) File f2.txt exists while file f1.txt doesn't

2. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 14
C) 12
D) 11

3. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) falsetruetrue
B) truetruefalse
C) truetruetrue
D) Compilation fails
E) truefalsetrue

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

5. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMM dd
B) MM d
C) MM dd
D) MMMM dd

Solutions: