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

2. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
B) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6

3. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) Compilation fails
C) nothing
D) default

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) 012
B) An exception is thrown
C) Nothing
D) 01
E) Compilation fails

5. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel Dior Louis Vuitton
C) Compilation fails.
D) Chanel

Solutions: