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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Which of the following java.io.Console methods doesnotexist?

A) readPassword(String fmt, Object... args)
B) read()
C) readLine()
D) readLine(String fmt, Object... args)
E) readPassword()
F) reader()

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

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

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) bac
C) acb
D) bca
E) abc
F) cba
G) cbca

5. 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, 0.88f, 10);
B) var concurrentHashMap = new ConcurrentHashMap();
C) None of the suggestions.
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

Solutions: