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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Which of the following can be the body of a lambda expression?

A) None of the above
B) A statement block
C) Two statements
D) Two expressions
E) An expression and a statement

3. Which of the following doesnotexist?

A) They all exist.
B) BiSupplier<T, U, R>
C) LongSupplier
D) DoubleSupplier
E) Supplier<T>
F) BooleanSupplier

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) {}
B) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
C) An exception is thrown at runtime.
D) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
E) Compilation fails.

5. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) fos.writeObject("Today");
B) fos.write("Today");
C) oos.writeObject("Today");
D) oos.write("Today");

Solutions: