Oracle 1z1-830 : Java SE 21 Developer Professional

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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

Question 2

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A. {a=3, b=1, c=2}
B. {a=1, b=2, c=3}
C. {c=2, a=3, b=1}
D. {c=1, b=2, a=3}
E. Compilation fails
F. {b=1, c=2, a=3}
G. {b=1, a=3, c=2}

Question 3

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

Question 4

Which of the followingisn'ta correct way to write a string to a file?

A. java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
B. java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
C. java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
D. None of the suggestions
E. java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
F. java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}

Question 5

Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A. 1 1 2
B. An exception is thrown.
C. 1 2 2
D. 2 1 2
E. 2 1 1
F. 1 1 1
G. 1 2 1
H. 2 2 1
I. 2 2 2

Solutions: