🎯 1. What Are Generics?

Generics allow you to write code that works with ANY type, but in a type-safe way.

In short:

• Write code once
• Use it for many data types
• Catch errors at compile time, not runtime

⭐ 2. Why Generics Exist? (The Core Problem)

❌ Without Generics (Old Java):

Listlist=newArrayList();
list.add("Java");
list.add(10);// allowed 😱

Strings= (String) list.get(1);// Runtime error

Problems:

❌ No type safety

❌ Manual casting

❌ Runtime ClassCastException

✔ With Generics:

List<String> list =newArrayList<>();
list.add("Java");
// list.add(10); ❌ compile-time error

Strings= list.get(0);// safe

💡 Errors caught early → safer code.