Oracle Java SE 21 Developer Professional : 1z1-830

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Oracle Java SE 21 Developer Professional Sample Questions:

1. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) null
B) Compilation fails
C) Java
D) Optional[Java]

2. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) home
B) IllegalArgumentException
C) C:
D) C
E) Compilation error

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

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

4. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) Compilation fails
B) IOException
C) ArithmeticException
D) RuntimeException

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

Solutions: