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

2. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) Compilation fails.
B) It throws an exception.
C) _$
D) 10

3. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
B) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
C) MyService service = ServiceLoader.getService(MyService.class);
D) MyService service = ServiceLoader.load(MyService.class).iterator().next();

4. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ ,hello,h i]
B) [,hello,hi]
C) [ , hello ,hi ]
D) [,hello,h i]

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

Solutions: