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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom bam
B) bim bam followed by an exception
C) bim boom
D) Compilation fails.
E) bim bam boom

3. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) Compilation fails at line n1.
B) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
C) Nothing
D) An exception is thrown at runtime.
E) Compilation fails at line n2.

4. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) string
B) long
C) nothing
D) integer
E) Compilation fails.
F) It throws an exception at runtime.

5. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) falsetruetrue
B) truetruefalse
C) truefalsetrue
D) truetruetrue
E) Compilation fails

Solutions: