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Question ID 3539

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?
 

Option A

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

Option B

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

Option C

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

Option D

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

Option E

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

Correct Answer D
Explanation


Question ID 3540

Option A

A.    Null B D
 

Option B

B.    Null B null D
 

Option C

C.    B D
 

Option D

D.    D
 

Option E

E.    An exception is thrown at runtime
 

Correct Answer C
Explanation

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