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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array5
B) array3
C) array4
D) array1
E) array2

3. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 2 2
B) 5 5 2 3
C) 1 1 2 3
D) 1 5 5 1
E) 1 1 1 1

4. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Nothing
B) Compilation fails.
C) An exception is thrown at runtime.
D) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose

5. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) fos.write("Today");
B) oos.writeObject("Today");
C) oos.write("Today");
D) fos.writeObject("Today");

Solutions: