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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument is null
B) Only if assertions are enabled and the input argument isn't null
C) Only if assertions are disabled and the input argument isn't null
D) Only if assertions are disabled and the input argument is null
E) A NullPointerException is never thrown

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

3. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 2
B) Line 3 only
C) Line 2 and line 3
D) The program successfully compiles
E) Line 1 and line 3
F) Line 2 only
G) Line 1 only

4. Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?

A) It does not compile.
B) It throws an exception at runtime.
C) It compiles.

5. Which of the following statements are correct?

A) None
B) You can use 'public' access modifier with all kinds of classes
C) You can use 'protected' access modifier with all kinds of classes
D) You can use 'private' access modifier with all kinds of classes
E) You can use 'final' modifier with all kinds of classes

Solutions: