How to write nullable int in java?

Question

I want to convert a web form to a model in Java.

In C# I can write this:

<input name="id" value="" type="text"/>   public class Test {     public int? Id{get;set;} } 

The id can be null.

But in Java when using struts2 it throws an exception:

Method "setId" failed 

So how to write this case in Java?

Answer 1

Instead of using int you can use Integer (Integer javadoc) because it is a nullable Java class.