How to cast an Object to an int

Question

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

Answer 1

I guess you're wondering why C or C++ lets you manipulate an object pointer like a number, but you can't manipulate an object reference in Java the same way.

Object references in Java aren't like pointers in C or C++... Pointers basically are integers and you can manipulate them like any other int. References are intentionally a more concrete abstraction and cannot be manipulated the way pointers can.

Answer 2

Answer:

int i = ( Integer ) yourObject;

If, your object is an integer already, it will run smoothly. ie:

Object yourObject = 1;
//  cast here

or

Object yourObject = new Integer(1);
//  cast here

etc.

If your object is anything else, you would need to convert it ( if possible ) to an int first:

String s = "1";
Object yourObject = Integer.parseInt(s);
//  cast here

Or

String s = "1";
Object yourObject = Integer.valueOf( s );
//  cast here

Answer 3

Refer This code:

public class sample 
{
  public static void main(String[] args) 
  {
    Object obj=new Object();
    int a=10,b=0;
    obj=a;
    b=(int)obj;

    System.out.println("Object="+obj+"\nB="+b);
  }
}

Answer 4

Can't be done. An int is not an object, it's a primitive type. You can cast it to Integer, then get the int.

 Integer i = (Integer) o; // throws ClassCastException if o.getClass() != Integer.class

 int num = i; //Java 1.5 or higher

Answer 5

Assuming the object is an Integer object, then you can do this:

int i = ((Integer) obj).intValue();

If the object isn't an Integer object, then you have to detect the type and convert it based on its type.

Answer 6

For Example Object variable; hastaId

Object hastaId = session.getAttribute("hastaID");

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For Example Cast an Object to an int,hastaID

int hastaID=Integer.parseInt(String.valueOf(hastaId));