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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \
green\
blue \
""";
B) None of the propositions
C) java
String colors = """
red
green
blue
""";
D) java
String colors = """
red \t
green\t
blue \t
""";
E) java
String colors = """
red \s
green\s
blue \s
""";

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

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

4. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) 3.3
B) true
C) Compilation fails
D) false
E) An exception is thrown at runtime

5. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?

A) [ , hello ,hi ]
B) [,hello,hi]
C) [ ,hello,h i]
D) [,hello,h i]

Solutions: