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Object Initialization

 
Ranch Hand
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import java.util.*;

public class AllFinals
{
final Vector v;
public AllFinals()
{
}
}

The above code will


1.Not compile. Vector v is not initialized.
2.Will compile and throw a RuntimeException
3.Will compile and not throw any Exception during runtime. V is initalized to null.

Answer is 1.
My question is v should get initialized to null (default value for an object) and if that is the case answer should be 3.
can anybody explain?
 
Greenhorn
Posts: 11
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v is final, cause of that, you must initialize it before contructor ends.
 
Greenhorn
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You are correct the answer is 1 , that is because v is final without any initialization parameters i.e it is a blank final and must be initialized in the constructor to null or any other valid value you wish to.
 
Ranch Hand
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final variables can assign a value once.the compiler will not initilaze any default value

Narendra
 
Srinivas Kumar
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Thanks to all for the explanation
 
Consider Paul's rocket mass heater.
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