Constants. Final variables

Why does the code work?

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The StringBuilder class represents a string that can be modified.

Suppose we have an object of this class and use its methods to modify the string.

final StringBuilder builder = new StringBuilder();
builder.append("123");

Why does this code work correctly?

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The final keyword makes a constant reference, but does not prohibit changing the internal state of the object.

This is a lie — the code does not work at all!

The final keyword does not work with reference variables.

The final keyword allows changing the value of a variable once.

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