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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom
B) bim bam boom
C) bim boom bam
D) bim bam followed by an exception
E) Compilation fails.

3. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.empty();
B) Stream stream = Stream.generate(() -> "a");
C) Stream<String> stream = Stream.builder().add("a").build();
D) Stream stream = Stream.ofNullable("a");
E) Stream stream = Stream.of();
F) Stream stream = new Stream();

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

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

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

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

Solutions: