What is difference between string and stringBuilder?

Question

Accepted Answer

String is immutable while StringBuilder is mutable. StringBuilder is more efficient for concatenating multiple strings.

String is immutable, meaning once created it cannot be changed. Any operation that appears to modify a string actually creates a new string object.
StringBuilder is mutable, allowing for modifications to the existing object without creating a new one. This makes it more efficient for concatenating multiple strings.
String concatenation using '+' operator creates a new string object each time, while StringBuilder's append method modifies the existing object directly.
Example: String str = "Hello"; StringBuilder sb = new StringBuilder(); sb.append("Hello");

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