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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) array3
C) array2
D) array5
E) array4

2. Which of the following methods of java.util.function.Predicate aredefault methods?

A) not(Predicate<? super T> target)
B) or(Predicate<? super T> other)
C) isEqual(Object targetRef)
D) and(Predicate<? super T> other)
E) negate()
F) test(T t)

3. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) IOException
B) ArithmeticException
C) RuntimeException
D) Compilation fails

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

5. Which of the following doesnotexist?

A) LongSupplier
B) DoubleSupplier
C) BiSupplier<T, U, R>
D) They all exist.
E) Supplier<T>
F) BooleanSupplier

Solutions: