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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) An exception is thrown at running Iphone15.ring();
B) Everything compiles
C) SmartPhone interface does not compile
D) Iphone15 class does not compile

2. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US=UK
B) Compilation fails.
C) =US-UK
D) -US=UK
E) US-UK
F) An exception is thrown.

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

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

4. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) default
B) static
C) Compilation fails
D) nothing

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

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

Solutions: