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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

2. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?

A) An exception is thrown
B) Compilation fails
C) ok the 2024-07-10T07:17:45.523939600
D) ok the 2024-07-10

3. 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) ImplementingInterface
B) ExtendingClass
C) WithInstanceField
D) WithStaticField

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

5. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:Baguette, dish:Frog legs, no cheese.
B) bread:Baguette, dish:Frog legs, cheese.
C) Compilation fails.
D) bread:bread, dish:dish, cheese.

Solutions: