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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

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

2. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) A
B) None of the above
C) D
D) C
E) B
F) E

3. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) An exception is always thrown
B) Both files f1.txt and f2.txt exist
C) File f2.txt exists while file f1.txt doesn't
D) File f1.txt exists while file f2.txt doesn't
E) Neither files f1.txt nor f2.txt exist

4. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) B b = new Test.B();
B) A a = new Test().new A();
C) A a = new Test.A();
D) B b = new Test().new B();
E) A a = new A();
F) B b = new B();

5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) C
B) home
C) Compilation error
D) IllegalArgumentException
E) C:

Solutions: