- A final variable – value cannot be changed once initialized and attempt to change the value will result in a compiler error.
- Provides us security and thread safety
- If your object is accessed by multiple threads, and you don’t declare its fields final, then you must provide thread-safety by some other means.
- Final variables are not stored on each object and hence it is essentially a constant.
- Final can be applied to,
- Instance Variable (non static variable)
- Static Variable
- Local Variable
- Parameter Variable
1 2 3 | final int SIZE = 10;int mySize = ++SIZE; //Compiler ERROR. //The final local variable SIZE cannot be assigned. |
