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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:Baguette, dish:Frog legs, no cheese.
B) bread:bread, dish:dish, cheese.
C) Compilation fails.
D) bread:Baguette, dish:Frog legs, cheese.

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

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

3. Which of the following can be the body of a lambda expression?

A) Two expressions
B) A statement block
C) Two statements
D) None of the above
E) An expression and a statement

4. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) JeanneJames
B) Compilation fails
C) JamesJeanne
D) MissingResourceException
E) Jeanne
F) James

5. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) fos.writeObject("Today");
B) oos.writeObject("Today");
C) oos.write("Today");
D) fos.write("Today");

Solutions: