Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) null
B) Compilation fails
C) Optional[Java]
D) Java

2. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'public' access modifier with all kinds of classes
D) You can use 'protected' access modifier with all kinds of classes
E) You can use 'final' modifier with all kinds of classes

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

4. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) -US=UK
B) An exception is thrown.
C) =US-UK
D) US=UK
E) US-UK
F) Compilation fails.

5. Which of the following doesnotexist?

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

Solutions: