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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var a = 1;(Valid: var correctly infers int)
C) var f = { 6 };
D) var h = (g = 7);
E) var b = 2, c = 3.0;
F) var e;

2. Which of the following java.io.Console methods doesnotexist?

A) readPassword(String fmt, Object... args)
B) readLine()
C) readLine(String fmt, Object... args)
D) reader()
E) readPassword()
F) read()

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

4. Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?

A) Rose
B) Beaujolais Nouveau, Chablis, Dom Perignon, Saint-Emilion
C) Saint-Emilion
D) Beaujolais Nouveau, Chablis, Saint-Emilion

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

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

Solutions: