In Java, these are the difference between String, String Builder and String Buffer:
| String | String Buffer | String Builder |
|---|
| Immutable (cannot be changed after creation) | Mutable (can be changed after creation) | Mutable (can be changed after creation) |
| Thread Safe (Can be used across threads) | Thread Safe (Can be used across threads) | Not thread safe |
| Performance is good | Performance is slow due to synchronized overhead | Performance is good |
| '+' operation can be used in String to add two strings | '+' operation is not allowed | '+' operation is not allowed |
| Stored in constant String pool | Stored in Heap area of memory | Stored in Heap area of memory
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