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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) An exception is thrown.
B) Compilation fails.
C) ABC
D) abc

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

3. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream stream = Stream.of();
C) Stream stream = Stream.empty();
D) Stream<String> stream = Stream.builder().add("a").build();
E) Stream stream = new Stream();
F) Stream stream = Stream.of("a");
G) Stream stream = Stream.generate(() -> "a");

4. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) long
B) It throws an exception at runtime.
C) integer
D) nothing
E) Compilation fails.
F) string

5. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42);
B) var concurrentHashMap = new ConcurrentHashMap(42, 10);
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
E) None of the suggestions.

Solutions: