Oracle Java SE 21 Developer Professional : 1z1-830 valid dump

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) bca
B) cbca
C) cacb
D) abc
E) cba
F) acb
G) bac

2. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) -UnitedSTATES
B) UnitedStates
C) United-States
D) -UNITEDSTATES
E) United-STATES
F) UNITED-STATES
G) -UnitedStates

3. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) An exception is thrown at runtime.
B) Compilation fails.
C) Sum: 22.0, Max: 8.5, Avg: 5.0
D) Sum: 22.0, Max: 8.5, Avg: 5.5

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

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

5. 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) 42000E
B) 42000
C) 42 000,00 €
D) 42 k

Solutions: