title: What does the sign ' | ' mean in java?
body: <p>I have come across the code and I am wondering what does it do?</p>
  
  <pre><code>for(int i=1;i&lt;32;i++){
  
      for(int j=1;j&lt;32;j++){
  
          if(( i | j )==31){ // here the sing ' | '
  
           }
       }
    }
  </code></pre>