确保使用Java初始化final字段

Question

I extend a class with multiple constructors. I add a final field in my subclass which ofcourse needs to be initialized in my own constructors.

The problem is I don't want to re-implement (most) of the constructors of the superclass, so I would like to do something like this:

public myConstructor(Object... params){
    super(params);
    try{
        this.finalField = "backup value";
    }
    catch(someException e){

    }
}

Is this possible in some way or the other?

edit : I realized this scenario will never happen, because the superclass constructor will never call my own constructor.

Answer 1

To simplify process of object initialization, usually I use the following solutions:

• You could create a static-factory method which will be create object (and throw exceptions if needed) instead of constructors and provide common initialization functionality in reusable private method.
• Also you could use Builder-pattern instead of multiple constructors. http://en.wikipedia.org/wiki/Builder_pattern

Answer 2

让所有构造函数都调用一个用于设置final字段的构造函数。