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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2
B) An exception is thrown.
C) 1 2 3 4
D) Compilation fails.
E) 0 1 2 3
F) 1 2 3

2. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 2
B) 0
C) Optional.empty
D) Optional[1]
E) An exception is thrown
F) Compilation fails
G) 1

3. 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) Compilation error
B) C
C) C:
D) home
E) IllegalArgumentException

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

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

5. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) US=UK
B) An exception is thrown.
C) =US-UK
D) Compilation fails.
E) US-UK
F) -US=UK

Solutions: