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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 2
B) It throws an exception at runtime.
C) Compilation fails.
D) 1
E) 0

2. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42 k
B) 42000
C) 42000E
D) 42 000,00 €

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

4. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new Test().new B();
B) A a = new A();
C) B b = new B();
D) A a = new Test().new A();
E) A a = new Test.A();
F) B b = new Test.B();

5. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of();
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.ofNullable("a");
D) Stream stream = new Stream();
E) Stream stream = Stream.empty();
F) Stream stream = Stream.generate(() -> "a");

Solutions: