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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) An exception is thrown.
B) US-UK
C) -US=UK
D) Compilation fails.
E) =US-UK
F) US=UK

4. Which of the following doesnotexist?

A) BooleanSupplier
B) Supplier<T>
C) LongSupplier
D) BiSupplier<T, U, R>
E) DoubleSupplier
F) They all exist.

5. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) It throws an exception at runtime.
B) Compilation fails.
C) 1
D) 0
E) 2

Solutions: