Java — Final VS Immutability | Code Factory

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• If you don’t want to perform reassignment for the variable then it is a final.
• If you don’t want to perform any changes in the object then it is a immutable.

final StringBuffer sb = new StringBuffer("Code");
sb.append("Factory");
System.out.println(sb); // CodeFactory
sb = new StringBuffer("Hello"); // CE : cannot assign a value to final variable sb

Which of the following are meaningful?

1. final variable ✓
2. final object X
3. Immutable variable X
4. Immutable object ✓