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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 1 2 2
B) 2 1 2
C) 1 2 1
D) An exception is thrown.
E) 2 1 1
F) 1 1 2
G) 1 1 1
H) 2 2 1
I) 2 2 2

3. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new B();
B) A a = new Test.A();
C) B b = new Test.B();
D) A a = new A();
E) B b = new Test().new B();
F) A a = new Test().new A();

4. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) Compilation fails.
B) bread:Baguette, dish:Frog legs, cheese.
C) bread:bread, dish:dish, cheese.
D) bread:Baguette, dish:Frog legs, no cheese.

5. Which of the following can be the body of a lambda expression?

A) None of the above
B) Two expressions
C) Two statements
D) A statement block
E) An expression and a statement

Solutions: