Atomic Variables

Question 1

Atomically updatable boolean value.

Answer 1

java.util.concurrent.atomic.AtomicBoolean

Question 2

Atomically updatable int value, extends Number class

Answer 2

java.util.concurrent.atomic.AtomicInteger

Question 3

An int array in which elements can be updated atomically.

Answer 3

java.util.concurrent.atomic.AtomicIntegerArray

Question 4

Atomically updatable long value, extends Number class.

Answer 4

java.util.concurrent.atomic.AtomicLong

Question 5

A long array in which elements can be updated atomically.

Answer 5

java.util.concurrent.atomic.AtomicLongArray

Question 6

An atomically updatable object reference of type V

Answer 6

java.util.concurrent.atomic.AtomicReference

Question 7

An atomically updatabale object array that can hold references of type E.

Answer 7

java.util.concurrent.atomic.AtomicReferenceArray

Question 8

Constructor that creates an instance of AtomicInteger with initial value 0.

Answer 8

AtomicInteger()

Question 9

Overloaded constructor of AtomicInteger that creates it with an initial value set by initVal

Answer 9

AtomicInteger(int initVal)

Question 10

Returns the value held by the object.

Answer 10

int get()

Question 11

Resets the integer value held in this object to newVal.

Answer 11

void set(int newVal)

Question 12

Returns the current int value held in this object and sets the value held in this object to newVal.

Answer 12

int getAndSet(int newValue)

Question 13

Compares the int value of this object to the expect value, and if they are equal, sets the int value of this object to the update value.

Answer 13

boolean compareAndSet(int expect, int update)

Question 14

Returns the current value of the integer value in this object and increments the integer value in this object. Atomic version of i++.

Answer 14

int getAndIncrement()

Question 15

Returns the current value of the integer value in this object and decrements the integer value in this object. Atomic version of i–

Answer 15

int getAndDecrement()

Question 16

Returns the integer value held in this object and adds given delta value to the integer value.

Answer 16

int getAndAdd(int delta)

Question 17

Increments the current value of the integer value in this object and returns that value. Atomic version of ++i.

Answer 17

int incrementAndGet()

Question 18

Decrements the current integer value in this object and returns that value. Atomic version of –i.

Answer 18

int decrementAndGet()

Question 19

Adds the delta value to the current value of integer in this object and returns that value.

Answer 19

int addAndGet(int delta)

Question 20

Casts the current int value of the object and returns it as int, long, float or double values.

Answer 20

int XXXvalue() where XXX is int, float, long or double.