Creating Nullables types in java

Question

I am trying to create a nullalble object in Java but no idea how to do this , in C# this would be done like this ``` int? someTestInt; ``` This allows me to check for for null , while in certain cases i can use a 0 value ,this isnt always possible since certain execution paths allow 0 values

Accepted Answer

I'm not entirely sure what you want, but if you want to have an integer value that also can be declared `null`, you probably want to use the `Integer` class:

```
Integer nullableInteger = 1;
nullableInteger = null;
System.out.println(nullableInteger); // "null"
```

There are corresponding classes for each primitive: `Character`, `Long`, `Double`, `Byte`, etc. The 'standard library' numeric classes all extend the `Number` class.

Note that Java autoboxes these objects automatically since JDK 1.5, so you can use and declare them just like the primitives (no need for e.g. "`new Integer(1)`"). So, although they are technically objects (and, therefore, extend the `Object` class, which the primitive `int` type does not), you can do basic arithmetics with them. They are converted to object operations at compile time.

Creating Nullables types in java

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