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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A) 42 42
B) 666 666
C) Compilation fails
D) 666 42

2. Which of the followingisn'ta correct way to write a string to a file?

A) None of the suggestions
B) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
C) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
D) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
E) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
F) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);

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

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 2
B) Line 1 and line 3
C) Line 2 and line 3
D) The program successfully compiles
E) Line 3 only
F) Line 2 only
G) Line 1 only

5. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) Chanel
B) An ArrayIndexOutOfBoundsException is thrown at runtime.
C) Chanel Dior Louis Vuitton
D) Compilation fails.

Solutions: