1Z0-804 Exam Dumps | Given the interface: Public interface Idgenerator { int getNextId(); } Which class implements IdGenerator

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Oracle.1z0-804.v2018-04-12.q150
Question 133

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Question 133/150

Given the interface:
Public interface Idgenerator {
int getNextId();
}
Which class implements IdGenerator in a thread-safe manner, so that no threads can get a duplicate id
value current access?

A. Public class generator Implements IdGenerator {
Private AtomicInteger id = new AtomicInteger (0);
return id.incrementAndget();
}}

B. Public class Generator Implements idGenerator {
private int id = 0;
return ++id;
}}

C. Public class Generator Implements IdGenerator {
private volatile int Id = 0;
return ++Id;
}

D. Public class Generator Implements IdGenerator {
private int id = 0;
public int getNextId() {
synchronized (new Generator()) {
return ++id;
}}}

E. Public class Generator Implements IdGenerator {
private int id = 0;
public int getnextId() {
synchronized (id) {
return ++id;
}}}

Correct Answer: D

Explanation/Reference:
Explanation:
Code that is safe to call by multiple threads simultaneously is called thread safe. If a piece of code is
thread safe, then it contains no race conditions. Race condition only occur when multiple threads update
shared resources. Therefore it is important to know what resources Java threads share when executing.
In Java you can mark a method or a block of code as synchronized. Synchronized blocks can be used to
avoid race conditions.
A, B, C : false: wrong Implementation ( missing int getNextId(); )
E: false: synchronized (mutex Object! not Simple Data Type)

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