java - Verify business rules -

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i have rules validade model class mybean. it's done ifs chain inside 1 method (validatemybean). don't way, seems fuzzy.

what's best approach validade many business rules? 

public class mybean {     private int id;     private string email;     private int age;     private string country;     private double otherfield;     //getter , setter }  public class mybeanfacade {     //database connection , other methods }  public class mybeanbusiness {     private mybeanfacade facade;     private mybean mybean;      public boolean validatemybean() {          if(!this.mybean.getemail().contains("@") {              return false;         }          if(this.mybean.getage()<18 || this.mybean.getage()>150) {              return false;         }          if(this.mybean.getcountry().startswith("a") || this.mybean.getcountry().startswith("b") || this.mybean.getcountry().startswith("c") || ) {              return false;         }          if(this.mybean.getotherfield() >= 0.123) {              return false;         }          if(facade.existsemail(mybean.getemail())) {              return false;         }         return true;     } }

put validation logic setter methods, prevent invalid values ever being set. throw exception reject given value. eliminates need validation method, , guarantees validation code run every set value.

better yet, eliminate setters taking values in constructor, guarantee validation executed. if there many parameters 1 constructor, make use of builder pattern.


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