Oracle Java SE 1z1-830

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

2. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A) A a = new Test().new A();
B) A a = new A();
C) B b = new Test.B();
D) A a = new Test.A();
E) B b = new B();
F) B b = new Test().new B();

3. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMMM dd
B) MM d
C) MM dd
D) MMM dd

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

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

5. Which of the following isn't a valid option of the jdeps command?

A) --generate-module-info
B) --list-reduced-deps
C) --print-module-deps
D) --list-deps
E) --generate-open-module
F) --check-deps

Solutions: