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Revature QC > Java > Flashcards

Java Flashcards

1
Q

Describe caching in a cpu.

A

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2
Q

Describe deadlock.

A

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3
Q

Describe visibility of a variable.

A

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4
Q

Describe volatility and the volatile keyword.

A

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5
Q

Does a thread get its own heap?

A

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6
Q

Does a thread get its own stack?

A

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7
Q

Give examples of some concurrency safe collections.

A

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8
Q

Give some examples of collections that are not concurrency safe.

A

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9
Q

How can enums help with making singletons thread safe?

A

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10
Q

How can we alter the singleton design pattern to be thread safe?

A

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11
Q

How do we fix race conditions?

A

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12
Q

In java multithreading, what is the monitor design pattern?

A

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13
Q

Is the classic singleton design pattern thread safe?

A

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14
Q

What are Consumer interfaces?

A

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15
Q

What are locks and keys?

A

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16
Q

What are Predicate interfaces, and what do they return?

A

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17
Q

What are the states of a thread?

A

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18
Q

What design pattern can we use to reuse threads and minimize the overhead in an application?

A

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19
Q

What does the .interrupt method do to a thread?

A

Moves a thread from the running state to the runnable state

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20
Q

What does the .join method do to a thread?

A

Calling thread enters the waiting state until the referenced thread terminates

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21
Q

What does the .notifyAll method do?

A

All threads are moved from the waiting state to the runnable state

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22
Q

What does the .notify method do to a thread?

A

One thread is moved from the waiting state to runnable state (chosen by the schedular)

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23
Q

What does the streams method, filter, do?

A

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24
Q

What does the streams method, map, do?

A

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25
Q

What does the streams method, reduce, do?

A

Combines all elements in a stream into one element

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26
Q

What does the .wait method do to a thread?

A

Moves a thread from the running state to the waiting state

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27
Q

What interface defines the void run method for threads?

A

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28
Q

What is a Collector?

A

A mutable reduction operation that accumulates input elements into a mutable result container, optionally transforming the accumulated result into a final representation after all input elements have been processed.

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29
Q

What is a Deque?

A

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30
Q

What is a functional interface?

A

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31
Q

What is a HashMap?

A

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32
Q

What is a HashSet?

A

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33
Q

What is a HashTable?

A

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34
Q

What is a Instant class?

A

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35
Q

What is a Linked List?

A

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36
Q

What is a Map?

A

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37
Q

What is a mutex?

A

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38
Q

What is an Array List?

A

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39
Q

What is an intermediate operation of streams?

A

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40
Q

What is a predicate?

A

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41
Q

What is a race condition?

A

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42
Q

What is a reentrant lock and how is it used in java synchronization?

A

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43
Q

What is a semaphore?

A

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44
Q

What is a terminating operation of streams?

A

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45
Q

What is a thread?

A

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46
Q

What is a TreeMap?

A

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47
Q

What is a TreeSet?

A

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48
Q

What is a Vector?

A

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49
Q

What is caching?

A

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50
Q

What is covariance?

A

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51
Q

What is method overloading?

A

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52
Q

What is method overriding?

A

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53
Q

What is mutual exclusion?

A

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54
Q

What is over/under flow (widening and narrowing)?

A

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55
Q

What is parallelism in java multithreading?

A

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56
Q

What is starvation?

A

When a thread cannot access a shared resource due to other threads using too frequently

57
Q

What is the callable interface?

A

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58
Q

What is the Collection interface?

A

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59
Q

What is the Collections class?

A

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60
Q

What is the Date Time api?

A

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61
Q

What is the difference between a checked and unchecked exception?

A

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62
Q

What is the difference between a HashTable and a HashMap?

A

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63
Q

What is the difference between a List and a Set?

A

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64
Q

What is the difference between a Set and a Queue?

A

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65
Q

What is the difference between Errors and Exceptions?

A

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66
Q

What is the difference between final, finalize, and finally?

A

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67
Q

What is the difference between java8 date time api vs java7 date time api (why did they remake it?

A

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68
Q

What is the difference between throw and throws?

A

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69
Q

What is the executor design pattern?

A

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70
Q

What is the executor interface?

A

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71
Q

What is the factory design pattern?

A

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72
Q

What is the Iterable interface?

A

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73
Q

What is the java.util.function package?

A

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74
Q

What is the producer consumer problem?

A

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75
Q

What is the purpose of connection pooling in jdbc or other connection style implementations?

A

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76
Q

What is the purpose of the Collections API

A

A collections framework represents a unified application programming interface for not only representing collections of objects, but also for manipulating them in a consistent manner at a high enough level of abstraction to encourage reusability and good object-oriented design.

77
Q

What is the purpose of the thread schedular?

A

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78
Q

What is the ReadWriteLock interface in java and what are some notable subclasses?

A

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79
Q

What is the Runnable design pattern?

A

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80
Q

What is the singleton design pattern?

A

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81
Q

What is the stream api?

A

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82
Q

What is thread pooling?

A

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83
Q

What is type casting?

A

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84
Q

What is up and down casting?

A

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85
Q

When adding the synchronized keyword to the method signature, what object is used for the key?

A

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86
Q

Which class can we extend to create a custom thread in java?

A

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Revature QC (6 decks)

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