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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?

A) It's a string with value: 42
B) null
C) Compilation fails.
D) It's a double with value: 42
E) It throws an exception at runtime.
F) It's an integer with value: 42

2. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are disabled and the input argument isn't null
B) Only if assertions are enabled and the input argument isn't null
C) A NullPointerException is never thrown
D) Only if assertions are enabled and the input argument is null
E) Only if assertions are disabled and the input argument is null

3. Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?

A) format2
B) format3
C) format1
D) format4

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

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

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

Solutions: