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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 1
B) 2
C) An exception is thrown
D) 0
E) Optional[1]
F) Compilation fails
G) Optional.empty

2. 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) MM dd
B) MMM dd
C) MMMM dd
D) MM d

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

4. Which of the following java.io.Console methods doesnotexist?

A) readLine()
B) readLine(String fmt, Object... args)
C) reader()
D) readPassword()
E) read()
F) readPassword(String fmt, Object... args)

5. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) True
B) False

Solutions: