Purchase Oracle : 1z1-830 Exam Materials and then pass exam easily
Updated: Jun 03, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle Java SE 21 Developer Professional Sample Questions:
1. 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) Compilation fails
C) default
D) static
2. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
A) MMM dd
B) MM d
C) MMMM dd
D) MM dd
3. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?
A) An exception is thrown at runtime.
B) Peugeot 807
C) Compilation fails.
D) Peugeot
4. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?
A) Compilation fails
B) truefalsetrue
C) truetruetrue
D) truetruefalse
E) falsetruetrue
5. 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 2 only
C) Line 3 only
D) Line 2 and line 3
E) Line 1 and line 3
F) The program successfully compiles
G) Line 1 only
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: C | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: F |
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