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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) 012
B) Compilation fails
C) An exception is thrown
D) 01
E) Nothing

3. 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) Compilation fails
B) null
C) Java
D) Optional[Java]

4. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truetruetrue
B) Compilation fails
C) truefalsetrue
D) falsetruetrue
E) truetruefalse

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

Solutions: