CODEWITHSUNDEEP
javathread-safety
Oomph Fortuity
Oomph Fortuity

Reputation: 6148

Static method calling another Static method with Object reference as parameter :Is It Thread Safe?

i have Static Method and it is calling another static method within itself.

for example : 

public List<Object> static first(int id){

       List<Object> list=new ArrayList<Object>();
       list.add(a);
       list.add(b);
       list.add(c);

       //calling another static method   
       second(id,list);

       return list;

}

public String static second(int id,List<Object> listRef){

       listRef.add(a);
       listRef.add(b);
       listRef.add(c);


}

My Question IS:

Multiple thread is calling public static method first(int id); with different id.

This is thread safe way Or Not? As i am declaring arrayList within method And i thing it's reference may share by other threads.

Problem is That Array Is stored in heap memory not in Individual Threads Stack.So i think sharing of Array reference by many threads may happen.

Upvotes: 1

Views: 191

Answers (4)

rocketboy
rocketboy

Reputation: 9741

Each thread gets its own copy of the method. Static methods are just methods which belong to the Class instead of object. As long as you are not manipulating any shared variables or resources, it is thread safe.

Upvotes: 2

Syed Siraj Uddin
Syed Siraj Uddin

Reputation: 593

what kind of objects are a,b & c? As this is just adding of stuff into a list and then calling another static method, I do not see any issues

So yes its thread safe..

Upvotes: 1

Zolt&#225;n
Zolt&#225;n

Reputation: 22166

It is thread safe as long as you don't call second directly from each thread. To that end, you should consider making second a private method.

Upvotes: 1

Kayaman
Kayaman

Reputation: 73568

Yes, it is thread-safe. Your ArrayList is a local variable and is not shared by threads (unless you explicitly do something to share it).

In this case every thread will simply have their own ArrayList.

Upvotes: 10

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