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Oracle 1z0-830 Exam Syllabus Topics:

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) 666 42
D) Compilation fails

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

3. Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A) False
B) True

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

5. Which of the following methods of java.util.function.Predicate aredefault methods?

A) test(T t)
B) isEqual(Object targetRef)
C) or(Predicate<? super T> other)
D) and(Predicate<? super T> other)
E) negate()
F) not(Predicate<? super T> target)

Solutions: