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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Which methods compile?

A) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
B) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
C) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
D) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}

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

4. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap();
B) var concurrentHashMap = new ConcurrentHashMap(42);
C) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) None of the suggestions.

5. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array1
B) array4
C) array3
D) array2
E) array5

Solutions: