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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) A NullPointerException is thrown.
B) false
C) A ClassCastException is thrown.
D) true
E) Compilation fails.

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

3. Which two of the following aren't the correct ways to create a Stream?

A) Stream<String> stream = Stream.builder().add("a").build();
B) Stream stream = Stream.empty();
C) Stream stream = Stream.of();
D) Stream stream = Stream.generate(() -> "a");
E) Stream stream = Stream.ofNullable("a");
F) Stream stream = new Stream();
G) Stream stream = Stream.of("a");

4. Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A) An exception is thrown at runtime.
B) arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
C) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
D) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
E) Compilation fails.

5. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red
green
blue
""";
B) java
String colors = """
red \t
green\t
blue \t
""";
C) java
String colors = """
red \s
green\s
blue \s
""";
D) java
String colors = """
red \
green\
blue \
""";
E) None of the propositions

Solutions: