title: Static method local variables and thread-safety
body: <p>With normal instance methods, local variables are thread safe.</p>
  
  <p>If I have the following in a static method:</p>
  
  <pre><code>int i = 0;
  i += 3;
  </code></pre>
  
  <p>Would this be thread-safe? Is there any catch?</p>
  
  <p>Also, what exactly does it mean when each variable has its own stack? Does that mean its own stacktrace?</p>
  
  <p>Thanks</p>