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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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

2. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) ClassCastException
B) Compilation fails
C) 1
D) 2
E) NotSerializableException

3. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) It's an integer with value: 42
C) null
D) It throws an exception at runtime.
E) It's a double with value: 42
F) Compilation fails.

4. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) Compilation fails
B) {b=1, a=3, c=2}
C) {a=3, b=1, c=2}
D) {b=1, c=2, a=3}
E) {a=1, b=2, c=3}
F) {c=2, a=3, b=1}
G) {c=1, b=2, a=3}

5. Which of the following can be the body of a lambda expression?

A) Two expressions
B) A statement block
C) Two statements
D) An expression and a statement
E) None of the above

Solutions: