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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) ok the 2024-07-10
C) Compilation fails
D) An exception is thrown

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

3. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) Optional[Java]
B) null
C) Compilation fails
D) Java

4. 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) C
B) IllegalArgumentException
C) Compilation error
D) home
E) C:

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

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

Solutions: