How does Java/C# allocate memory when multiple threads call same functions

Suppose below code:

Class test
{
   void foo()
   {
      int i=0;
   }
}

Test t=new Test();
// if many threads call t.foo();

Does each thread has its own memory for calling foo? It means each thread has it's own i?

How does Java/C# allocate memory when it calls the function? As I remember, in C#, each thread will be allocated 1M memory. What about Java?

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Link to original article：https://stackoverflow.com/questions/15424542/how-does-java-c-allocate-memory-when-multiple-threads-call-same-functions