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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) It throws an exception.
B) _$
C) 10
D) Compilation fails.

3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) An exception is thrown.
B) Compilation fails.
C) abc
D) ABC

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) The program successfully compiles
B) Line 1 and line 3
C) Line 3 only
D) Line 2 only
E) Line 1 only
F) Line 1 and line 2
G) Line 2 and line 3

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

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

Solutions: