op2

Question 1

Java provides support for functional programming expressions.

Answer 1

True

Question 2

Java supports multiple inheritance.

Answer 2

False

Question 3

Java does not support pointer arithmetic on its references.

Answer 3

True

Question 4

Variables declared as static can only be assigned a value once.

Answer 4

False

Question 5

Java supports use of varargs.

Answer 5

True

Question 6

A serialized object representation in Java contains the object data and metadata (e.g., threads) and its class file.

Answer 6

False

Question 7

Upon creation of a Thread object, its run() method is immediately started.

Answer 7

False

Question 8

After the run() method of a Thread object is complete, the Thread object is automatically deleted by the garbage collector.

Answer 8

False

Question 9

A new Thread object must be used each time a runnable code is to be started.

Answer 9

True

Question 10

The execution order of Java threads may be hard to predict.

Answer 10

True

Question 11

The execution order of Java threads is deterministic.

Answer 11

False

Question 12

Java objects by default comprise a single read lock, which can be upgraded to a write lock.

Answer 12

False

Question 13

Java objects by default comprise a single read lock, which is used for locking synchronized code.

Answer 13

True

Question 14

If a thread T wants to access synchronized code of an object which is already locked by another thread U, the thread T is put to sleep and put into a waiting queue.

Answer 14

False

Question 15

Runnable is an interface to implement a run() method and used for Java threads.

Answer 15

True

Question 16

After the run() method of a thread object is complete, the thread object continues to exist.

Answer 16

True

Question 17

The run() method of a thread object can be invoked more than once.

Answer 17

False

Question 18

The Java runtime environment resumes blocked threads in order of their waiting time.

Answer 18

False

Question 19

JavaFX bindings define constraints for the layout of UI elements.

Answer 19

False

Question 20

Stage objects in JavaFX are windows which can host UI elements.

Answer 20

False

Question 21

JavaFX supports the observer design pattern.

Answer 21

True

Question 22

Access to JavaFX elements like labels of buttons can be done by any thread of a Java program.

Answer 22

False

Question 23

The Java ServerSocket class is used to create TCP sockets.

Answer 23

True

Question 24

The Java ServerSocket class is used to create UDP or TCP sockets.

Answer 24

False

Question 25

Serialized objects can be transmitted over a TCP connection.

Answer 25

True

Question 26

Spatial uncoupling is a property which some indirect services provide.

Answer 26

True

Question 27

A tuple space provides persistent storage of data until the data gets explicitly removed.

Answer 27

True

Question 28

UDP message passing may imply space uncoupling.

Answer 28

False

Question 29

Java RMI stands for Java Rapid Model Interaction.

Answer 29

False

Question 30

Java RMI requires that all access to remote methods uses call-by-value for passing parameters.

Answer 30

False

Question 31

Naming.lookup() returns a copy of a remote object from an RMI registry.

Answer 31

False

Question 32

AJAX stands for Advanced Java Application Extensions.

Answer 32

False

Question 33

Servlets are Java objects which can be executed in a web server to handle user requests.

Answer 33

True

Question 34

Servlets do not need synchronization to handle concurrent client accesses as they are synchronized by default.

Answer 34

False

Question 35

Java Server Faces support the creation of dynamic webpages.

Answer 35

True

Question 36

The HTTP command cannot be used to transmit data from a client to a web server.

Answer 36

False

Question 37

A serialized object representation in Java contains the object data and its class file.

Answer 37

False

Question 38

Message queue systems may implement different queue models.

Answer 38

True

Question 39

In transient asynchronous communication, the sender continues its operation after sending a message without waiting for an answer by the receiver.

Answer 39

True

Question 40

Persistent indirect communication requires buffering of messages.

Answer 40

True

Question 41

Email servers provide time uncoupling.

Answer 41

True

Question 42

JGroups implements an RPC (remote procedure calling) mechanism.

Answer 42

True

Question 43

In JGroups, one defines channels to handle message groups.

Answer 43

True

Question 44

Message queue systems provide unreliable point-to-point communication.

Answer 44

False

Question 45

The Java class library provides the DatagramPacket object to represent UDP packets.

Answer 45

True

Question 46

Java RMI stands for Java Remote Method Invocation.

Answer 46

True

Question 47

ExecutorServices are used to allocate runnables or callables to threads.

Answer 47

True

Question 48

Calling the get() method on a Future object can result in a blocking situation.

Answer 48

True

Question 49

A system that stays responsive under verying workload is called elastic

Answer 49

True

Question 50

Loose coupling and isolation should be avoided as it makes date exchange unnecessarily hard to implement

Answer 50

False

Question 51

Asynchronus message passing establishes a boundary between components

Answer 51

True

Question 52

In case of errors, the system is allowed to slow down and not respond in a timely manner

Answer 52

False

Question 53

The Java Compiler ensures that thread switches will not occure between operations contained in a single line of source code

Answer 53

False

Question 54

CompletableFutures offer the same error-handling capatibilities as Futures

Answer 54

False

Question 55

Mailing lists provide space and time uncoupling

Answer 55

True

Question 56

In ideal group communication, messages are recieved simultaniously by all reciepents

Answer 56

True

Question 57

HTTP connections allow servers to initiate communication to a client

Answer 57

False

Question 58

IP Multicast provides time uncoupling

Answer 58

False

Question 59

Tuple space support reading and removing of entries by client

Answer 59

True

Question 60

Tuple Spaces store data only for a fixed amount of time, after which it is automatically deleted in order to implement disapearing messages

Answer 60

False

Question 61

Message queue systems decouple space and time

Answer 61

True

Question 62

WAN stands for Wide Area Network and is a competing standard to WLAN

Answer 62

False

Question 63

Nowdays the choice of a specific Network Topology doesnt need to be considered anymore when designing networks, as the topology makes little to no difference

Answer 63

False

Question 64

Broadcasting needs collision detection mechanisms

Answer 64

True

Question 65

With the advent...Iso..high/definition content

Answer 65

False

Question 66

Java Optionals can help to write more readable code

Answer 66

True

Question 67

Java Optionals is an alternative to using Null Pointers

Answer 67

True

Question 68

Java Optionals cannot throw a NUllPOinterException when calling Optional of T

Answer 68

False

Question 69

Java Optionals can be processed as elements of a stream

Answer 69

True

Question 70

Objects should be used to bundle long parameter lists

Answer 70

True

Question 71

Choose method names using conventions

Answer 71

True

Question 72

Prefer longer parameter lists

Answer 72

False

Question 73

Avoid sequences of same typed parameters

Answer 73

True

Question 74

Java bindings can couple properties of UI elements bidirectionally

Answer 74

True

Question 75

Access to JavaFX elements, like labels of buttons, can be done by any thread of a Java program

Answer 75

False