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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 1 2 3 4
B) An exception is thrown.
C) 0 1 2
D) 0 1 2 3
E) 1 2 3
F) Compilation fails.

2. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) ok the 2024-07-10
B) An exception is thrown
C) Compilation fails
D) ok the 2024-07-10T07:17:45.523939600

3. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) A a = new Test().new A();
B) B b = new Test.B();
C) B b = new B();
D) B b = new Test().new B();
E) A a = new A();
F) A a = new Test.A();

4. 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) 1
B) An exception is thrown
C) Optional.empty
D) 0
E) Compilation fails
F) Optional[1]
G) 2

5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) IllegalArgumentException
B) C:
C) Compilation error
D) home
E) C

Solutions: