Once an environment has been created, the next step is to create a model. A Gurobi model holds a single optimization problem. It consists of a set of variables, a set of constraints, and the associated attributes (variable bounds, objective coefficients, variable integrality types, constraint senses, constraint right-hand side values, etc.). The first step towards building a model that contains all of this information is to create an empty model object:
// Create empty model GRBModel model = new GRBModel(env);
The constructor takes the previously created environment as its argument.