title: Difference between Semaphore initialized with 1 and 0
body: <p>Please tell what is difference Semaphore initialized with 1 and zero. as below:</p>
  
  <pre><code>public static Semaphore semOne = new Semaphore(1);
  </code></pre>
  
  <p>and</p>
  
  <pre><code>public static Semaphore semZero = new Semaphore(0);
  </code></pre>