Integer overflow in Java

What would happen in Java when you increment an Integer variable that already contains its maximum value?

No, Java would not throw any exception :(

Lets write a simple program to test it:

    
public static void main(String[] args) {
   int i = Integer.MAX_VALUE;
   System.out.println("Before: " + i 
             + " = " + Integer.toBinaryString(i));

   i++;
   System.out.println("After: " + i 
             + " = " + Integer.toBinaryString(i));        
}

The output is:

Before: 2147483647 = 01111111111111111111111111111111
After: -2147483648 = 10000000000000000000000000000000

As you see, it is negative.

So, when you increment Integer.MAX_VALUE by 1 it becomes Integer.MIN_VALUE.