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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A. bread:Baguette, dish:Frog legs, cheese.
B. bread:Baguette, dish:Frog legs, no cheese.
C. Compilation fails.
D. bread:bread, dish:dish, cheese.

Question 2

Which of the following suggestions compile?(Choose two.)

A. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
B. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
C. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
D. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}

Question 3

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

Question 4

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. array5
C. array4
D. array3
E. array2

Question 5

Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A. oos.write("Today");
B. fos.writeObject("Today");
C. fos.write("Today");
D. oos.writeObject("Today");

Solutions: