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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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(42, 10);
B) None of the suggestions.
C) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) var concurrentHashMap = new ConcurrentHashMap();

2. 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) array2
B) array5
C) array4
D) array3
E) array1

3. Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

A) Compilation fails.
B) Nothing
C) vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
D) An exception is thrown at runtime.

4. 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) Compilation fails.
B) An exception is thrown at runtime.
C) Peugeot
D) Peugeot 807

5. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) Compilation fails.
B) It throws an exception.
C) _$
D) 10

Solutions: