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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var f = { 6 };
C) var a = 1;(Valid: var correctly infers int)
D) var h = (g = 7);
E) var b = 2, c = 3.0;
F) var e;

2. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 14
B) 10
C) 11
D) 12

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

4. 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
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed 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
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}

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: