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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Everything compiles
B) SmartPhone interface does not compile
C) An exception is thrown at running Iphone15.ring();
D) Iphone15 class does not compile

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

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

3. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var e;
B) var b = 2, c = 3.0;
C) var h = (g = 7);
D) var f = { 6 };
E) var d[] = new int[4];
F) var a = 1;(Valid: var correctly infers int)

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

5. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
B) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
C) An exception is thrown at runtime.
D) {}
E) Compilation fails.

Solutions: