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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

A) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
B) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
C) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
D) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
E) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);

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

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

4. Which of the following statements is correct about a final class?

A) It cannot extend another class.
B) The final keyword in its declaration must go right before the class keyword.
C) It cannot be extended by any other class.
D) It cannot implement any interface.
E) It must contain at least a final method.

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

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

Solutions: