Suppose we have a stack of string, but later we want to use it for integers. We have to re-write the code again and again for every data type. So how can we solve this.
Attempt 1 - Creating the stack for every data type, which is very exhaustive and needs code changes again.
**Attempt 2 - **Implement a stack using Object class.
Example
Downside -
- Discover type mismatch errors at run time
- Casting has to be done at client side
- Code looks ugly because of so many castings
Attempt 3 - Java generics