What is the primary difference between StringBuilder and StringBuffer classes in Java?
- StringBuffer is not synchronized, making it faster but not thread-safe.
- StringBuilder has more methods for manipulating strings.
- StringBuilder is immutable, while StringBuffer is mutable.
- StringBuilder is synchronized, making it thread-safe but potentially slower.
The primary difference is that StringBuilder is not synchronized, making it faster but not thread-safe, while StringBuffer is synchronized, making it thread-safe but potentially slower. Immutable means unchangeable, which is not true for either class.
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