强制性地逐步构建对象

Question

i need to create objects following an sequence of rules

public class MyClass {
    private Double field1;
    private Integer field2;
    private Double fiels3;
    //getters setters
}

I need to calculate first field1:

MyClass object = new MyClass();
object.setField1(OtherClass.calculateField1(parameter1, parameter2, parameter3));

Than calculate field2, but field1 must be calculated before, because to calculate the second field2 need field1 to be done:

MyClass object = new MyClass();
object.setField1(OtherClass.getField2(object, parameter4, parameter5));

For set field3 i need the field2 and field1 calculated, and so on

How force who is creating the object MyClass to follow this sequence o creation? A Chain of resposability can help me?

Answer 1

Few options, ordered from more from more appropiated to less

• Force calculation throught constructor
• Force calculation throught one single method
• Throw exception in setField2 if field1 is not set