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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) RuntimeException
B) ArithmeticException
C) Compilation fails
D) IOException

2. Which of the following statements is correct about a final class?

A) It must contain at least a final method.
B) The final keyword in its declaration must go right before the class keyword.
C) It cannot implement any interface.
D) It cannot extend another class.
E) It cannot be extended by any other class.

3. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) It throws an exception at runtime.
B) 0
C) 2
D) 1
E) Compilation fails.

4. 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) Iphone15 class does not compile
D) SmartPhone interface does not compile

5. Which of the following isn't a valid option of the jdeps command?

A) --list-deps
B) --check-deps
C) --list-reduced-deps
D) --generate-open-module
E) --print-module-deps
F) --generate-module-info

Solutions: