title: What is Objective coefficient for new variable
body: <p>In order to create new GRBVar, I need to provide Objective coefficient for <a href="http://www.gurobi.com/documentation/6.5/refman/java_grbmodel_addvar.html" rel="nofollow">new variable</a>:</p>
  
  <pre><code>GRBVar var = model.addVar (double lowerBound,
          double upperBound,
          double obj, // objective coefficient
          char type,
          String name);
  </code></pre>
  
  <p>According to <a href="http://www.gurobi.com/documentation/6.5/examples/mip1_java.html" rel="nofollow">this example</a>, the value can be set to 0. So I wonder what objective coefficient is.</p>