Oracle 1z1-830 : Java SE 21 Developer Professional

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) Chanel Dior Louis Vuitton
C) Compilation fails.
D) An ArrayIndexOutOfBoundsException is thrown at runtime.

2. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) Compilation fails.
C) It's an integer with value: 42
D) null
E) It throws an exception at runtime.
F) It's a double with value: 42

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

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

5. 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) nothing
B) static
C) default
D) Compilation fails

Solutions: