PDF Version DemoOracle Java SE 21 Developer Professional Sample Questions:
1. Which of the following methods of java.util.function.Predicate aredefault methods?
A) isEqual(Object targetRef)
B) or(Predicate<? super T> other)
C) test(T t)
D) not(Predicate<? super T> target)
E) and(Predicate<? super T> other)
F) negate()
2. 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) oos.writeObject("Today");
B) fos.write("Today");
C) oos.write("Today");
D) fos.writeObject("Today");
3. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?
A) None of the above
B) D
C) E
D) B
E) A
F) C
4. 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) array1
B) array2
C) array4
D) array5
E) array3
5. 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) Line 3 only
B) Line 1 only
C) Line 1 and line 3
D) The program successfully compiles
E) Line 2 and line 3
F) Line 2 only
G) Line 1 and line 2
Solutions:
| Question # 1 Answer: B,E,F | Question # 2 Answer: A | Question # 3 Answer: A | Question # 4 Answer: A,D | Question # 5 Answer: D |
We are confident about the products and aim to help you pass with ease. In case of failure, we will provide a no hassle full money back guarantee for the purchasing fee.
1099 Customer Reviews
Quality and ValueITbraindumps Practice Exams are written to the highest standards of technical accuracy, using only certified subject matter experts and published authors for development - no all study materials.
Tested and ApprovedWe are committed to the process of vendor and third party approvals. We believe professionals and executives alike deserve the confidence of quality coverage these authorizations provide.
Easy to PassIf you prepare for the exams using our ITbraindumps testing engine, It is easy to succeed for all certifications in the first attempt. You don't have to deal with all dumps or any free torrent / rapidshare all stuff.
Try Before BuyITbraindumps offers free demo of each product. You can check out the interface, question quality and usability of our practice exams before you decide to buy.