Given that a method named Double getPrice(String id) exists and may potentially return null, about which of the following options can you be certain that a runtime exception will not be thrown?. Please select 2 options.

Optional<Double> price = Optional.ofNullable(getPrice("1111")); Double x = price.orElse(getPrice("2222"));

Optional<Double> price = Optional.ofNullable(getPrice("1111")); Double y = price.orElseGet(()->getPrice("333"));

Optional<Double> price = Optional.of(getPrice("1111"));

Optional<Double> price = Optional.of(getPrice("1111"), 10.0);

Optional<Double> price = Optional.of(getPrice("1111")); Double z = price.orElseThrow(()->new RuntimeException("Bad Code"));

Which of the following statements will print /test.txt when executed on a Unix/Linux system? Please select 1 option.

System.out.println(Paths.get("/", "test.txt"));

System.out.println(Path.get("/test.txt"));

System.out.println(new Path("/test.txt"));

System.out.println(Path.toPath("/test.txt"));

System.out.println(Paths.toPath("/test.txt"));

Identify correct statement(s) regarding the benefit of using PreparedStatement over Statement. Please select 1 option.

PreparedStatement offers protection against SQL injection attacks.

PreparedStatement allows transactions to span across multiple databases.

PreparedStatement allows easier customization of joins at run time.

PreparedStatement allows BLOB and CLOB on all databases.

Which of the following are benefits of ArrayList over an array?. Please select 1 option.

You do not have to worry about the size of the ArrayList while appending elements.

You do not have to worry about thread safety.

It allows you to write type safe code.

Given: var sList = new CopyOnWriteArrayList<Student>(); which of the following statements are correct?. Please select 1 option.

Multiple threads can safely add and remove objects from sList simultaneously.

Student class must be Cloneable or Serializable

Student objects retrieved from sList are thread safe.

Multiple threads can get Student objects from sList but can't add to it in a thread safe manner simultaneously.

Any code that adds objects to sList must be synchronized but code that gets objects need not be.

Yoy want to use a third party JDBC driver for a database. Which of the following actions must you take to retrieve a Connection using that driver in your JDBC program? Please select 2 options.

Put the driver jar in the class path.

Retrieve a connection using DriverManager.getConnection.

Load the driver class using Class.forName

Create an instance of the Driver class using the new keyword.

Load the driver class using Class.forName and then retrieve a connection using DriverManager.getConnection.

Which of these statements are true? Please select 2 options.

The main method of a program can declare that it throws checked exceptions.

A method declaring that it throws a certain exception class may throw instances of any subclass of that exception class.

If a RuntimeException is not caught, the method will terminate and normal execution of the thread will resume.

An overriding method must declare that it throws the same exception classes as the method it overrides.

finally blocks are executed if and only if an exception gets thrown while inside the corresponding try block.

Which of the following statements are correct about --jdk-internals option of jdeps tool when run on a jar file or a class file? . Please select 2 options.

It analyzes all classes of the given jar file for class level dependence on jdk's internal API. If any such dependence is found, it is printed with a suggestion for replacement.

It analyzes all classes of the given jar file for class level dependence on Java API.

It analyzes all classes of the given jar file for class level dependence on jdk's deprecated API. If any such dependence is found, it is printed with a suggestion for replacement.

It analyzes all input modules and list all jdk internal modules on which the input modules depend. If any such dependence is found, it is printed with a suggestion for replacement.

Identify correct statements about the modular JDK. Please select 3 options.

The foundational APIs of the Java SE platform are found in java.base module.

JDK is divided into a set of modules that can be combined at compile time, build time, and run time into a variety of configurations.

The modular JDK is divided of two kinds of modules - the standard modules and the non-standard modules.

The modular JDK is composed of two modules - the java module and the jdk module.

Simulacro Java 21 - 5

Authored by José Diaz

Professional Development

1st Grade

Used 8+ times

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MULTIPLE SELECT QUESTION

2 mins • 1 pt

Which of the following is/are valid record definition(s)?. Please select 3 options.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

Which of these expressions will obtain the substring "456" from a string defined by
String str = """
0123\
4567"""?
Please select 1 option

str.substring(4, 7)

str.substring(4)

str.substring(5, 7)

str.substring(5, 8)

str.substring(4, 3)

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Java's exception mechanism helps in which of the following ways? Please select 2 options.

It allows creation of new exceptions that are custom to a particular application domain.

It improves code because error handling code is clearly separated from the main program logic.

It enhances the security of the application by reporting errors in the logs.

It improves the code because the exception is handled right at the place where it occured.

It provides a vast set of standard exceptions that covers all possible exceptions.

MULTIPLE SELECT QUESTION

2 mins • 1 pt

Please select 2 options.

printUsefulData(al, (Data d)-> { return d.value>2; } );

printUsefulData(al, d-> d.value>2 );

printUsefulData(al, (d)-> return d.value>2; );

printUsefulData(al, Data d-> d.value>2 );

printUsefulData(al, d -> d.value>2; );

MULTIPLE CHOICE QUESTION

2 mins • 1 pt