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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A) Compilation fails.
B) arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
C) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
D) An exception is thrown at runtime.
E) arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99

2. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) Compilation fails.
B) =US-UK
C) US-UK
D) -US=UK
E) US=UK
F) An exception is thrown.

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

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

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

5. Which three of the following are correct about the Java module system?

A) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
B) Code in an explicitly named module can access types in the unnamed module.
C) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
D) The unnamed module exports all of its packages.
E) The unnamed module can only access packages defined in the unnamed module.
F) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.

Solutions: