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Tuesday, July 19, 2022

[FIXED] How to cast an Object to an int

 July 19, 2022     casting, integer, java, object     No comments   

Issue

How can I cast an Object to an int in java?


Solution

If you're sure that this object is an Integer :

int i = (Integer) object;

Or, starting from Java 7, you can equivalently write:

int i = (int) object;

Beware, it can throw a ClassCastException if your object isn't an Integer and a NullPointerException if your object is null.

This way you assume that your Object is an Integer (the wrapped int) and you unbox it into an int.

int is a primitive so it can't be stored as an Object, the only way is to have an int considered/boxed as an Integer then stored as an Object.


If your object is a String, then you can use the Integer.valueOf() method to convert it into a simple int :

int i = Integer.valueOf((String) object);

It can throw a NumberFormatException if your object isn't really a String with an integer as content.


Resources :

  • Oracle.com - Autoboxing
  • Oracle.com - Primitive Data types

On the same topic :

  • Java: What's the difference between autoboxing and casting?
  • Autoboxing: So I can write: Integer i = 0; instead of: Integer i = new Integer(0);
  • Convert Object into primitive int


Answered By - Colin Hebert
Answer Checked By - Katrina (PHPFixing Volunteer)
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