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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Nothing
B) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
C) Compilation fails.
D) An exception is thrown at runtime.

2. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 0
B) 1
C) Optional.empty
D) Optional[1]
E) Compilation fails
F) An exception is thrown
G) 2

3. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) An exception is always thrown
B) Neither files f1.txt nor f2.txt exist
C) Both files f1.txt and f2.txt exist
D) File f2.txt exists while file f1.txt doesn't
E) File f1.txt exists while file f2.txt doesn't

4. Which of the following statements are correct?

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

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

Solutions: