/** * ZZJ07_F2.java * * @author Antonio J. Nebro * @author Juan J. Durillo * @version 1.0 */package jmetal.problems.ZZJ07;import jmetal.base.*;import jmetal.base.Configuration.*;import jmetal.util.JMException;/**  * Class representing problem ZZJ07_F2 */public class ZZJ07_F2 extends Problem {     /**    * Constructor   * Creates a default instance of the ZZJ07_F1 problemumbr   * @param solutionType The solution type must "Real" or "BinaryReal".   */  public ZZJ07_F2(String solutionType) {    this(30, solutionType); // 30 variables by default  }  /**    * Constructor   * Creates a default instance of the ZZJ07_F1 problem   * @param numberOfVariables Number of variables.   * @param solutionType The solution type must "Real" or "BinaryReal".   */  public ZZJ07_F2(Integer numberOfVariables, String solutionType) {    numberOfVariables_   = numberOfVariables.intValue() ;    numberOfObjectives_  = 2;    numberOfConstraints_ = 0;    problemName_         = "ZZJ07_F2";            upperLimit_ = new double[numberOfVariables_];    lowerLimit_ = new double[numberOfVariables_];    for (int var = 0; var < numberOfVariables_; var++){      lowerLimit_[var] = 0.0;      upperLimit_[var] = 1.0;    } // for            solutionType_ = Enum.valueOf(SolutionType_.class, solutionType) ;         // All the variables are of the same type, so the solutionType name is the    // same than the variableType name    variableType_ = new VariableType_[numberOfVariables_];    for (int var = 0; var < numberOfVariables_; var++){      variableType_[var] = Enum.valueOf(VariableType_.class, solutionType) ;        } // for  } //ZZJ07_F2      /**   * Evaluates a solution   * @param solution The solution to evaluate   * @throws JMException   */          public void evaluate(Solution solution) throws JMException {    DecisionVariables decisionVariables  = solution.getDecisionVariables();        double [] x  = new double[numberOfVariables_]  ;    double g   ;    double h   ;    double sum ;    for (int i = 0; i < numberOfVariables_; i++)      x[i] = decisionVariables.variables_[i].getValue() ;        sum = 0.0 ;    for (int i = 0; i < numberOfVariables_; i++)      sum += (x[i]-x[0])*(x[i]-x[0]);           g = 1.0 + 9.0*sum/(numberOfVariables_-1.0);    h = 1.0 - x[0]*x[0]/(g*g);        solution.setObjective(0,x[0]);    solution.setObjective(1,g*h);  } // evaluate} // ZZJ07_F2