Oracle Java SE 1z0-830

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truefalsetrue
B) truetruetrue
C) truetruefalse
D) falsetruetrue
E) Compilation fails

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

3. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class does not allow null elements.
B) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
C) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
D) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
E) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.

4. 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) 42000
B) 42 k
C) 42 000,00 €
D) 42000E

5. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It's an integer with value: 42
C) null
D) It's a double with value: 42
E) It throws an exception at runtime.
F) Compilation fails.

Solutions: