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

2. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 2
B) Compilation fails
C) It's always 1
D) It's either 1 or 2
E) It's either 0 or 1

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

4. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) Nothing
B) Compilation fails
C) An exception is thrown
D) 01
E) 012

5. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) WithStaticField
B) ImplementingInterface
C) ExtendingClass
D) WithInstanceField

Solutions: