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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) 42000E
C) 42 k
D) 42 000,00 €

2. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) Compilation fails.
B) bread:Baguette, dish:Frog legs, no cheese.
C) bread:bread, dish:dish, cheese.
D) bread:Baguette, dish:Frog legs, cheese.

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

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

4. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 11
B) 10
C) 12
D) 14

5. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 2 2
B) 1 2 2
C) 2 1 1
D) 1 1 2
E) 2 1 2
F) 2 2 1
G) 1 2 1
H) 1 1 1
I) An exception is thrown.

Solutions: